diff --git a/packages/controller/src/HostConnection.ts b/packages/controller/src/HostConnection.ts
index c50c5f3d..688130dc 100644
--- a/packages/controller/src/HostConnection.ts
+++ b/packages/controller/src/HostConnection.ts
@@ -81,6 +81,7 @@ export default class HostConnection extends BaseConnection {
 		this.handle(lib.InstanceSaveDetailsUpdatesEvent, this.handleInstanceSaveDetailsUpdatesEvent.bind(this));
 		this.handle(lib.LogMessageEvent, this.handleLogMessageEvent.bind(this));
 		this.handle(lib.InstancePlayerUpdateEvent, this.handleInstancePlayerUpdateEvent.bind(this));
+		this.handle(lib.FactorioVersionsRequest, this.handleFactorioVersionsRequest.bind(this));
 		this.snoopEvent(lib.InstanceAdminlistUpdateEvent, this.snoopInstanceAdminlistUpdateEvent.bind(this));
 		this.snoopEvent(lib.InstanceBanlistUpdateEvent, this.snoopInstanceBanlistUpdateEvent.bind(this));
 		this.snoopEvent(lib.InstanceWhitelistUpdateEvent, this.snoopInstanceWhitelistUpdateEvent.bind(this));
@@ -363,6 +364,10 @@ export default class HostConnection extends BaseConnection {
 		});
 	}
 
+	async handleFactorioVersionsRequest(request: lib.FactorioVersionsRequest) {
+		return await this._controller.factorioVersions.get(request.maxAgeMs);
+	}
+
 	async snoopInstanceAdminlistUpdateEvent(event: lib.InstanceAdminlistUpdateEvent, src: lib.Address) {
 		if (src.type !== lib.Address.instance) {
 			return;
diff --git a/packages/host/src/Instance.ts b/packages/host/src/Instance.ts
index 88cf50ae..af5b9ef4 100644
--- a/packages/host/src/Instance.ts
+++ b/packages/host/src/Instance.ts
@@ -639,8 +639,10 @@ end`.replace(/\r?\n/g, " ");
 
 	async init(pluginInfos: lib.PluginNodeEnvInfo[]) {
 		this.notifyStatus("starting");
+		const factorioVersions = await this.sendTo("controller", new lib.FactorioVersionsRequest());
 		try {
 			await this._loadStats();
+			await this.server.checkForUpdates(factorioVersions);
 			await this.server.init();
 		} catch (err) {
 			this.notifyExit();
diff --git a/packages/host/src/server.ts b/packages/host/src/server.ts
index dc45d101..23d46daa 100644
--- a/packages/host/src/server.ts
+++ b/packages/host/src/server.ts
@@ -2,6 +2,7 @@
 import fs from "fs-extra";
 import child_process from "child_process";
 import path from "path";
+import JSZip from "jszip";
 import events from "events";
 import util from "util";
 import crypto from "crypto";
@@ -9,16 +10,17 @@ import { Rcon } from "rcon-client";
 
 import * as lib from "@clusterio/lib";
 
+const execFileAsync = util.promisify(child_process.execFile);
 
 /**
  * Determines the version of Factorio the datadir is pointing to by
  * reading the changelog.txt in it.
  *
- * @param changelogPath - Path to changelog.txt.
- * @internal
+ * @param factorioDir - Path factorio dir containing data/changelog.txt.
  */
-async function getVersion(changelogPath: string) {
+async function getFactorioVersion(factorioDir: string) {
 	let changelog;
+	const changelogPath = path.join(factorioDir, "data", "changelog.txt");
 	try {
 		changelog = await fs.readFile(changelogPath, "utf-8");
 	} catch (err: any) {
@@ -28,12 +30,13 @@ async function getVersion(changelogPath: string) {
 		throw err;
 	}
 
-	for (let line of changelog.split(/[\r\n]+/)) {
-		let index = line.indexOf(":");
+	for (const line of changelog.split(/[\r\n]+/)) {
+		const index = line.indexOf(":");
 		if (index !== -1) {
-			let name = line.slice(0, index).trim();
+			const name = line.slice(0, index).trim();
 			if (name.toLowerCase() === "version") {
-				return line.slice(index + 1).trim();
+				const version = line.slice(index + 1).trim();
+				return lib.isFullVersion(version) ? version : null;
 			}
 		}
 	}
@@ -66,13 +69,122 @@ function versionOrder(a: string, b: string) {
 	return 0;
 }
 
+/**
+ * Find all installed factorio versions and return them as a set
+ *
+ * @param factorioDir - Path to Factorio installation dirs.
+ * @returns Set of installed factorio versions
+ */
+async function listFactorioVersions(factorioDir: string) {
+	const versions = new Set<lib.FullVersion>();
+
+	const directVersion = await getFactorioVersion(factorioDir);
+	if (directVersion !== null) {
+		versions.add(directVersion);
+		return { direct: true, versions };
+	}
+
+	for (const name of await fs.readdir(factorioDir)) {
+		// We do not use withFileTypes or lstat because we want to follow symlinks
+		const fullPath = path.join(factorioDir, name);
+		try {
+			const stats = await fs.stat(fullPath);
+			if (!stats.isDirectory()) {
+				continue;
+			}
+		} catch {
+			continue;
+		}
+
+		const version = await getFactorioVersion(fullPath);
+		if (version === null) {
+			continue;
+		}
+
+		versions.add(version);
+	}
+
+	return { direct: false, versions };
+}
+
+/**
+ * Downloads a ZIP file from a URL using native fetch and extracts it
+ *
+ * @param url - The URL of the ZIP file
+ * @param targetDir - Directory to extract the ZIP into
+ * @throws Network error if status of request is not ok
+ */
+async function downloadAndExtractZip(url: string, targetDir: string) {
+	const res = await fetch(url);
+	if (!res.ok) {
+		throw new Error(`Failed to fetch ${url}: ${res.status} ${res.statusText}`);
+	}
+
+  	// Load the ZIP with JSZip
+	const buffer = Buffer.from(await res.arrayBuffer());
+	const zip = await JSZip.loadAsync(buffer);
+
+  	// Extract each file/folder
+	await fs.ensureDir(targetDir);
+	await Promise.all(
+		Object.values(zip.files).map(async (entry) => {
+			const parts = entry.name.split("/").filter(Boolean);
+			const strippedPath = parts.slice(1).join("/");
+			if (!strippedPath) {
+				return; // This copies the behaviour of tar --strip-components 1
+			}
+
+			const entryPath = path.join(targetDir, strippedPath);
+			if (entry.dir) {
+				await fs.ensureDir(entryPath);
+			} else {
+				await fs.ensureDir(path.dirname(entryPath));
+				await fs.writeFile(entryPath, await entry.async("nodebuffer"));
+			}
+		})
+	);
+}
+
+/**
+ * Downloads a tar.gz file from a URL using native fetch and extracts it
+ *
+ * @param url - The URL of the ZIP file
+ * @param targetDir - Directory to extract the ZIP into
+ * @throws Network error if status of request is not ok
+ */
+async function downloadAndExtractTar(url: string, targetDir: string) {
+	const res = await fetch(url);
+	if (!res.ok) {
+		throw new Error(`Failed to fetch ${url}: ${res.status} ${res.statusText}`);
+	}
+
+	// Write the buffer to a temp file
+	const tmpFilePath = `${targetDir}.tmp`;
+	const buffer = Buffer.from(await res.arrayBuffer());
+	await fs.writeFile(tmpFilePath, buffer);
+	await fs.ensureDir(targetDir);
+
+	// Execute tar CLI to extract
+	try {
+		await execFileAsync("tar", ["-xf", tmpFilePath, "-C", targetDir, "--strip-components", "1"]);
+	} catch (err: any) {
+		if (err.code === "ENOENT") {
+			throw new Error("error executing tar command, do you have 'xz-utils' installed?");
+		}
+		throw err;
+	} finally {
+		// Clean up temp file
+		await fs.remove(tmpFilePath);
+	}
+}
+
 /**
  * Find factorio data directory of the given version
  *
  * Searches the given factorio dir for an installation of Factorio of
  * the target version.
  *
- * @param factorioDir - Path to Factorio installation dir(s).
+ * @param factorioDir - Path to Factorio installation dirs.
  * @param targetVersion -
  *     Version to look for, supports the special value "latest" for the
  *     latest version available.
@@ -80,40 +192,39 @@ function versionOrder(a: string, b: string) {
  * @internal
  */
 async function findVersion(factorioDir: string, targetVersion: lib.TargetVersion): Promise<[string, lib.FullVersion]> {
-
-	// There are two supported setups: having the factorio dir be the actual
-	// install directory, and having the factorio dir be a folder containing
-	// multiple install directories
-
-	let simpleVersion = await getVersion(path.join(factorioDir, "data", "changelog.txt"));
-	if (simpleVersion !== null) {
-		if (simpleVersion === targetVersion || simpleVersion.startsWith(targetVersion) || targetVersion === "latest") {
-			if (lib.isFullVersion(simpleVersion)) {
-				return [path.join(factorioDir, "data"), simpleVersion];
-			}
+	// Check if this is a direct installation dir
+	const directVersion = await getFactorioVersion(factorioDir);
+	if (directVersion !== null) {
+		if (targetVersion === "latest" || directVersion === targetVersion || directVersion.startsWith(targetVersion)) {
+			return [path.join(factorioDir, "data"), directVersion];
 		}
-
-		throw new Error(
-			`Factorio version ${targetVersion} was requested, but install directory contains ${simpleVersion}`
-		);
+		throw new Error(`Unable to find Factorio version ${targetVersion}`);
 	}
 
-	let versions = new Map<lib.FullVersion, string>();
-	for (let entry of await fs.readdir(factorioDir, { withFileTypes: true })) {
-		if (!entry.isDirectory()) {
+	// Otherwise assume it is a directory of multiple versions
+	const versions = new Map<lib.FullVersion, string>();
+	for (const name of await fs.readdir(factorioDir)) {
+		// We do not use withFileTypes or lstat because we want to follow symlinks
+		const fullPath = path.join(factorioDir, name);
+		try {
+			const stats = await fs.stat(fullPath);
+			if (!stats.isDirectory()) {
+				continue;
+			}
+		} catch {
 			continue;
 		}
 
-		let version = await getVersion(path.join(factorioDir, entry.name, "data", "changelog.txt"));
-		if (version === null || !lib.isFullVersion(version)) {
+		const version = await getFactorioVersion(fullPath);
+		if (version === null) {
 			continue;
 		}
 
 		if (version === targetVersion) {
-			return [path.join(factorioDir, entry.name, "data"), version];
+			return [path.join(factorioDir, name, "data"), version];
 		}
 
-		versions.set(version, entry.name);
+		versions.set(version, name);
 	}
 
 	if (!versions.size) {
@@ -871,6 +982,37 @@ export class FactorioServer extends events.EventEmitter<FactorioServerEvents> {
 		this._state = "init";
 	}
 
+	/**
+	 * Check of updated versions to download
+	 *
+	 * Should be called before init for the new version to be detected during init
+	 */
+	async checkForUpdates(availableVersions: lib.ExternalFactorioVersion[]) {
+		const targetVersion = this._targetVersion;
+		const latestVersion = availableVersions
+			.filter(v => (
+				targetVersion === "latest" || v.version === targetVersion || v.version.startsWith(targetVersion)
+			))
+			.sort((v1, v2) => versionOrder(v1.version, v2.version))
+			[0];
+
+		const installedVersions = await listFactorioVersions(this._factorioDir);
+		if (!installedVersions.versions.has(latestVersion.version)) {
+			const v = latestVersion.version;
+			// Can't download if not linux or this is a direct install
+			if (installedVersions.direct || process.platform !== "linux") {
+				this._logger.info(`A newer version of factorio is available (${v}) but must be manually downloaded`);
+				return;
+			}
+
+			// Download the newer version
+			this._logger.info(`A newer version of factorio is available (${v}), starting download...`);
+			const dst = path.join(this._factorioDir, latestVersion.version);
+			await downloadAndExtractTar(latestVersion.headlessUrl, dst);
+			this._logger.info(`Downloaded factorio version ${v}`);
+		}
+	}
+
 	/**
 	 * The version of Factorio in use. This will be the actual version if
 	 * "latest" (the default) was specified as `factorioVersion` to the constructor.
@@ -1421,9 +1563,12 @@ export class FactorioServer extends events.EventEmitter<FactorioServerEvents> {
 
 
 // For testing only
-export const _getVersion = getVersion;
+export const _getFactorioVersion = getFactorioVersion;
 export const _versionOrder = versionOrder;
 export const _findVersion = findVersion;
+export const _listFactorioVersions = listFactorioVersions;
+export const _downloadAndExtractZip = downloadAndExtractZip;
+export const _downloadAndExtractTar = downloadAndExtractTar;
 export const _randomDynamicPort = randomDynamicPort;
 export const _generatePassword = generatePassword;
 export const _parseOutput = parseOutput;
diff --git a/packages/lib/src/data/messages_controller.ts b/packages/lib/src/data/messages_controller.ts
index 53c48e74..2c74b4c2 100644
--- a/packages/lib/src/data/messages_controller.ts
+++ b/packages/lib/src/data/messages_controller.ts
@@ -402,7 +402,7 @@ export class DebugWsMessageEvent {
 export class FactorioVersionsRequest {
 	declare ["constructor"]: typeof FactorioVersionsRequest;
 	static type = "request" as const;
-	static src = "control" as const;
+	static src = ["control", "instance"] as const;
 	static dst = "controller" as const;
 	static permission = "core.external.get_factorio_versions" as const;
 
diff --git a/packages/lib/src/external/FactorioVersions.ts b/packages/lib/src/external/FactorioVersions.ts
index b9041fc0..45125433 100644
--- a/packages/lib/src/external/FactorioVersions.ts
+++ b/packages/lib/src/external/FactorioVersions.ts
@@ -60,7 +60,7 @@ function parseFactorioVersions(html: string): ExternalFactorioVersion[] {
 			versions.set(version, {
 				version: version,
 				stable: kind === "stable",
-				headlessUrl: `www.factorio.com/get-download/${version}/headless/linux64`,
+				headlessUrl: `https://www.factorio.com/get-download/${version}/headless/linux64`,
 			});
 		}
 	}
diff --git a/test/file/changelog-bad.txt b/test/file/changelogs/bad/data/changelog.txt
similarity index 100%
rename from test/file/changelog-bad.txt
rename to test/file/changelogs/bad/data/changelog.txt
diff --git a/test/file/changelog-test.txt b/test/file/changelogs/good/data/changelog.txt
similarity index 100%
rename from test/file/changelog-test.txt
rename to test/file/changelogs/good/data/changelog.txt
diff --git a/test/file/factorio/data/base/locale/en/base.cfg b/test/file/factorio/0.1.1/data/base/locale/en/base.cfg
similarity index 100%
rename from test/file/factorio/data/base/locale/en/base.cfg
rename to test/file/factorio/0.1.1/data/base/locale/en/base.cfg
diff --git a/test/file/factorio/data/changelog.txt b/test/file/factorio/0.1.1/data/changelog.txt
similarity index 100%
rename from test/file/factorio/data/changelog.txt
rename to test/file/factorio/0.1.1/data/changelog.txt
diff --git a/test/file/factorio/data/core/locale/en/core.cfg b/test/file/factorio/0.1.1/data/core/locale/en/core.cfg
similarity index 100%
rename from test/file/factorio/data/core/locale/en/core.cfg
rename to test/file/factorio/0.1.1/data/core/locale/en/core.cfg
diff --git a/test/file/factorio/0.1.2/data/base/locale/en/base.cfg b/test/file/factorio/0.1.2/data/base/locale/en/base.cfg
new file mode 100644
index 00000000..ae82115b
--- /dev/null
+++ b/test/file/factorio/0.1.2/data/base/locale/en/base.cfg
@@ -0,0 +1,4 @@
+; Test data for exportLocale
+[test]
+base-a=1
+base-b=2
diff --git a/test/file/factorio/0.1.2/data/changelog.txt b/test/file/factorio/0.1.2/data/changelog.txt
new file mode 100644
index 00000000..2b12ff4b
--- /dev/null
+++ b/test/file/factorio/0.1.2/data/changelog.txt
@@ -0,0 +1,3 @@
+---------------------------------------------------------------------------------------------------
+Version: 0.1.2
+About: Dummy changelog.txt for FactorioServer tests
diff --git a/test/file/factorio/0.1.2/data/core/locale/en/core.cfg b/test/file/factorio/0.1.2/data/core/locale/en/core.cfg
new file mode 100644
index 00000000..f414b76f
--- /dev/null
+++ b/test/file/factorio/0.1.2/data/core/locale/en/core.cfg
@@ -0,0 +1,4 @@
+; Test data for exportLocale
+[test]
+core-a=1
+core-b=2
diff --git a/test/file/factorio/not-a-dir b/test/file/factorio/not-a-dir
new file mode 100644
index 00000000..e69de29b
diff --git a/test/file/factorio/not-an-install/not-an-install b/test/file/factorio/not-an-install/not-an-install
new file mode 100644
index 00000000..e69de29b
diff --git a/test/file/factorio/not-full-version/data/base/locale/en/base.cfg b/test/file/factorio/not-full-version/data/base/locale/en/base.cfg
new file mode 100644
index 00000000..ae82115b
--- /dev/null
+++ b/test/file/factorio/not-full-version/data/base/locale/en/base.cfg
@@ -0,0 +1,4 @@
+; Test data for exportLocale
+[test]
+base-a=1
+base-b=2
diff --git a/test/file/factorio/not-full-version/data/changelog.txt b/test/file/factorio/not-full-version/data/changelog.txt
new file mode 100644
index 00000000..bc1a9058
--- /dev/null
+++ b/test/file/factorio/not-full-version/data/changelog.txt
@@ -0,0 +1,3 @@
+---------------------------------------------------------------------------------------------------
+Version: 0.1
+About: Dummy changelog.txt for FactorioServer tests
diff --git a/test/file/factorio/not-full-version/data/core/locale/en/core.cfg b/test/file/factorio/not-full-version/data/core/locale/en/core.cfg
new file mode 100644
index 00000000..f414b76f
--- /dev/null
+++ b/test/file/factorio/not-full-version/data/core/locale/en/core.cfg
@@ -0,0 +1,4 @@
+; Test data for exportLocale
+[test]
+core-a=1
+core-b=2
diff --git a/test/host/server.js b/test/host/server.js
index 1dc541cd..28d21054 100644
--- a/test/host/server.js
+++ b/test/host/server.js
@@ -8,20 +8,21 @@ const hostServer = require("@clusterio/host/dist/node/src/server");
 const lib = require("@clusterio/lib");
 const { wait } = lib;
 const { testLines } = require("../lib/factorio/lines");
+const { slowTest } = require("../integration");
 
 
 describe("host/server", function() {
-	describe("_getVersion()", function() {
+	describe("_getFactorioVersion()", function() {
 		it("should get the version from a changelog", async function() {
-			let version = await hostServer._getVersion(path.join("test", "file", "changelog-test.txt"));
+			let version = await hostServer._getFactorioVersion(path.join("test", "file", "changelogs", "good"));
 			assert.equal(version, "0.1.1");
 		});
 		it("should return null if unable to find the version", async function() {
-			let version = await hostServer._getVersion(path.join("test", "file", "changelog-bad.txt"));
+			let version = await hostServer._getFactorioVersion(path.join("test", "file", "changelogs", "bad"));
 			assert.equal(version, null);
 		});
 		it("should return null if file does not exist", async function() {
-			let version = await hostServer._getVersion(path.join("test", "file", "does-not-exist.txt"));
+			let version = await hostServer._getFactorioVersion(path.join("test", "file", "changelogs", "not-exists"));
 			assert.equal(version, null);
 		});
 	});
@@ -38,50 +39,131 @@ describe("host/server", function() {
 	});
 
 	describe("_findVersion()", function() {
-		it("should find a given install dir with latest as target", async function() {
-			let installDir = path.join("test", "file", "factorio");
-			let [dir, version] = await hostServer._findVersion(installDir, "latest");
-			assert.equal(dir, path.join(installDir, "data"));
-			assert.equal(version, "0.1.1");
+		describe("direct install", function() {
+			it("should search given directory for latest Factorio install", async function() {
+				const installDir = path.join("test", "file", "factorio", "0.1.2");
+				const [dir, version] = await hostServer._findVersion(installDir, "latest");
+				assert.equal(dir, path.join(installDir, "data"));
+				assert.equal(version, "0.1.2");
+			});
+			it("should search given directory for given Factorio install", async function() {
+				const installDir = path.join("test", "file", "factorio", "0.1.1");
+				const [dir, version] = await hostServer._findVersion(installDir, "0.1.1");
+				assert.equal(dir, path.join(installDir, "data"));
+				assert.equal(version, "0.1.1");
+			});
+			it("should search given directory for partly given Factorio install", async function() {
+				const installDir = path.join("test", "file", "factorio", "0.1.2");
+				const [dir, version] = await hostServer._findVersion(installDir, "0.1");
+				assert.equal(dir, path.join(installDir, "data"));
+				assert.equal(version, "0.1.2");
+			});
+			it("should reject if the version does not match", async function() {
+				let installDir = path.join("test", "file", "factorio", "0.1.1");
+				await assert.rejects(
+					hostServer._findVersion(installDir, "0.1.2"),
+					new Error("Unable to find Factorio version 0.1.2")
+				);
+			});
 		});
-		it("should find a given install dir with correct version as target", async function() {
-			let installDir = path.join("test", "file", "factorio");
-			let [dir, version] = await hostServer._findVersion(installDir, "0.1.1");
-			assert.equal(dir, path.join(installDir, "data"));
-			assert.equal(version, "0.1.1");
+		describe("mutli install", function() {
+			it("should reject if no factorio install with the given version was found", async function() {
+				let installDir = path.join("test", "file", "factorio");
+				await assert.rejects(
+					hostServer._findVersion(installDir, "0.1.3"),
+					new Error("Unable to find Factorio version 0.1.3")
+				);
+			});
+			it("should search given directory for given Factorio install", async function() {
+				const installDir = path.join("test", "file", "factorio");
+				const [dir, version] = await hostServer._findVersion(installDir, "0.1.1");
+				assert.equal(dir, path.join(installDir, "0.1.1", "data"));
+				assert.equal(version, "0.1.1");
+			});
+			it("should search given directory for partly given Factorio install", async function() {
+				const installDir = path.join("test", "file", "factorio");
+				const [dir, version] = await hostServer._findVersion(installDir, "0.1");
+				assert.equal(dir, path.join(installDir, "0.1.2", "data"));
+				assert.equal(version, "0.1.2");
+			});
+			it("should reject if no factorio install with the given version was found", async function() {
+				let installDir = path.join("test", "file", "factorio");
+				await assert.rejects(
+					hostServer._findVersion(installDir, "0.1.3"),
+					new Error("Unable to find Factorio version 0.1.3")
+				);
+			});
+			it("should reject if no factorio install was found", async function() {
+				let installDir = path.join("test", "file");
+				await assert.rejects(
+					hostServer._findVersion(installDir, "0.0.0"),
+					new Error(`Unable to find any Factorio install in ${installDir}`)
+				);
+			});
 		});
-		it("should reject if the install dir version does not match target version", async function() {
-			let installDir = path.join("test", "file", "factorio");
-			await assert.rejects(
-				hostServer._findVersion(installDir, "0.1.2"),
-				new Error("Factorio version 0.1.2 was requested, but install directory contains 0.1.1")
-			);
+	});
+
+	describe("_listFactorioVersions()", function() {
+		it("should list the version in a direct install", async function() {
+			const installDir = path.join("test", "file", "factorio", "0.1.1");
+			const installedVersions = await hostServer._listFactorioVersions(installDir);
+			assert.deepEqual(installedVersions, {
+				direct: true,
+				versions: new Set(["0.1.1"]),
+			});
 		});
-		it("should search given directory for latest Factorio install", async function() {
-			let installDir = path.join("test", "file");
-			let [dir, version] = await hostServer._findVersion(installDir, "latest");
-			assert.equal(dir, path.join(installDir, "factorio", "data"));
-			assert.equal(version, "0.1.1");
+		it("should list all versions in a directory", async function() {
+			const installDir = path.join("test", "file", "factorio");
+			const installedVersions = await hostServer._listFactorioVersions(installDir);
+			assert.deepEqual(installedVersions, {
+				direct: false,
+				versions: new Set(["0.1.1", "0.1.2"]),
+			});
 		});
-		it("should search given directory for given Factorio install", async function() {
-			let installDir = path.join("test", "file");
-			let [dir, version] = await hostServer._findVersion(installDir, "0.1.1");
-			assert.equal(dir, path.join(installDir, "factorio", "data"));
-			assert.equal(version, "0.1.1");
+	});
+
+	describe("downloadAndExtractZip", function() {
+		let _fetch;
+		beforeEach(function() {
+			_fetch = global.fetch;
 		});
-		it("should reject if no factorio install with the given version was found", async function() {
-			let installDir = path.join("test", "file");
-			await assert.rejects(
-				hostServer._findVersion(installDir, "0.1.2"),
-				new Error("Unable to find Factorio version 0.1.2")
-			);
+		afterEach(function() {
+			global.fetch = _fetch;
 		});
-		it("should reject if no factorio install was found", async function() {
-			let installDir = path.join("test", "file", "instances");
-			await assert.rejects(
-				hostServer._findVersion(installDir, "latest"),
-				new Error(`Unable to find any Factorio install in ${installDir}`)
-			);
+
+		it("works", async function() {
+			slowTest(this);
+			const url = "https://github.com/clusterio/clusterio/archive/refs/tags/v2.0.0-alpha.22.zip";
+			const downloads = path.join("temp", "test", "downloads");
+			await fs.emptyDir(downloads);
+			await hostServer._downloadAndExtractZip(url, path.join(downloads, "zip"));
+			assert.ok(await fs.exists(path.join(downloads, "zip", "packages", "controller", "package.json")));
+		});
+		it("errors and bad status", async function() {
+			global.fetch = () => ({ ok: false, status: -1, statusText: "Fetch called" });
+			await assert.rejects(hostServer._downloadAndExtractZip("url does not matter"), /-1 Fetch called/);
+		});
+	});
+
+	describe("downloadAndExtractTar", function() {
+		let _fetch;
+		beforeEach(function() {
+			_fetch = global.fetch;
+		});
+		afterEach(function() {
+			global.fetch = _fetch;
+		});
+
+		it("works", async function() {
+			const url = "https://github.com/clusterio/clusterio/archive/refs/tags/v2.0.0-alpha.22.tar.gz";
+			const downloads = path.join("temp", "test", "downloads");
+			await fs.emptyDir(downloads);
+			await hostServer._downloadAndExtractTar(url, path.join(downloads, "tar"));
+			assert.ok(await fs.exists(path.join(downloads, "tar", "packages", "controller", "package.json")));
+		});
+		it("errors and bad status", async function() {
+			global.fetch = () => ({ ok: false, status: -1, statusText: "Fetch called" });
+			await assert.rejects(hostServer._downloadAndExtractTar("url does not matter"), /-1 Fetch called/);
 		});
 	});
 
@@ -157,7 +239,7 @@ describe("host/server", function() {
 
 		describe(".version", function() {
 			it("should return the version detected", function() {
-				assert.equal(server.version, "0.1.1");
+				assert.equal(server.version, "0.1.2");
 			});
 		});
 
@@ -235,5 +317,305 @@ describe("host/server", function() {
 				await wait(21); // Wait until after shutdown timeout
 			});
 		});
+
+		describe(".checkForUpdates()", function() {
+			let _fetch;
+			let fetchCalledWith;
+			let _platform = process.platform;
+			beforeEach(function() {
+				_fetch = global.fetch;
+				fetchCalledWith = null;
+				global.fetch = async function(url) {
+					fetchCalledWith = url;
+					return {
+						ok: false,
+						status: -1,
+						statusText: "Fetch called",
+					};
+				};
+			});
+			afterEach(function() {
+				global.fetch = _fetch;
+				server._factorioDir = path.join("test", "file", "factorio");
+				Object.defineProperty(process, "platform", {
+					value: _platform,
+				});
+			});
+
+			describe("full version", function() {
+				it("should do nothing when there is no newer version", async function() {
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "0.1.1";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test1",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test2",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+				});
+				it("should do nothing for direct installs", async function() {
+					server._factorioDir = path.join("test", "file", "factorio", "0.1.1");
+					server._targetVersion = "0.1.5";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test1",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test2",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+				});
+				it("should do nothing when on windows", async function() {
+					let logLine = null;
+					server._logger = { info: line => { logLine = line; } };
+					Object.defineProperty(process, "platform", { value: "win32" });
+
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "0.1.5";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test2",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test3",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+					assert.ok(logLine !== null);
+					assert.ok(logLine.endsWith("but must be manually downloaded"));
+				});
+				it("should do attempt to download on linux", async function() {
+					let logLine = null;
+					server._logger = { info: line => { logLine = line; } };
+					Object.defineProperty(process, "platform", { value: "linux" });
+
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "0.1.5";
+					await assert.rejects(server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test2",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test3",
+					}]), new Error("Failed to fetch test1: -1 Fetch called"));
+
+					assert.equal(fetchCalledWith, "test1");
+					assert.ok(logLine !== null);
+					assert.ok(logLine.endsWith("starting download..."));
+				});
+			});
+			describe("partial version", function() {
+				it("should do nothing when there is no newer version", async function() {
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "0.1";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test1",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test2",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+				});
+				it("should do nothing for direct installs", async function() {
+					server._factorioDir = path.join("test", "file", "factorio", "0.1.1");
+					server._targetVersion = "0.1";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test1",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test2",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+				});
+				it("should do nothing when on windows", async function() {
+					let logLine = null;
+					server._logger = { info: line => { logLine = line; } };
+					Object.defineProperty(process, "platform", { value: "win32" });
+
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "0.1";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test2",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test3",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+					assert.ok(logLine !== null);
+					assert.ok(logLine.endsWith("but must be manually downloaded"));
+				});
+				it("should do attempt to download on linux", async function() {
+					let logLine = null;
+					server._logger = { info: line => { logLine = line; } };
+					Object.defineProperty(process, "platform", { value: "linux" });
+
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "0.1";
+					await assert.rejects(server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test2",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test3",
+					}]), new Error("Failed to fetch test1: -1 Fetch called"));
+
+					assert.equal(fetchCalledWith, "test1");
+					assert.ok(logLine !== null);
+					assert.ok(logLine.endsWith("starting download..."));
+				});
+			});
+			describe("latest version", function() {
+				it("should do nothing when there is no newer version", async function() {
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "latest";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test1",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test2",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+				});
+				it("should do nothing for direct installs", async function() {
+					server._factorioDir = path.join("test", "file", "factorio", "0.1.1");
+					server._targetVersion = "latest";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test1",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test2",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+				});
+				it("should do nothing when on windows", async function() {
+					let logLine = null;
+					server._logger = { info: line => { logLine = line; } };
+					Object.defineProperty(process, "platform", { value: "win32" });
+
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "latest";
+					await server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test2",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test3",
+					}]);
+
+					assert.equal(fetchCalledWith, null);
+					assert.ok(logLine !== null);
+					assert.ok(logLine.endsWith("but must be manually downloaded"));
+				});
+				it("should do attempt to download on linux", async function() {
+					let logLine = null;
+					server._logger = { info: line => { logLine = line; } };
+					Object.defineProperty(process, "platform", { value: "linux" });
+
+					server._factorioDir = path.join("test", "file", "factorio");
+					server._targetVersion = "latest";
+					await assert.rejects(server.checkForUpdates([{
+						stable: true,
+						version: "0.1.5",
+						headlessUrl: "test1",
+					}, {
+						stable: true,
+						version: "0.1.1",
+						headlessUrl: "test2",
+					}, {
+						stable: false,
+						version: "0.1.0",
+						headlessUrl: "test3",
+					}]), new Error("Failed to fetch test1: -1 Fetch called"));
+
+					assert.equal(fetchCalledWith, "test1");
+					assert.ok(logLine !== null);
+					assert.ok(logLine.endsWith("starting download..."));
+				});
+			});
+			it("should download a version correctly (live api)", async function() {
+				slowTest(this);
+				if (_platform !== "linux") {
+					this.skip();
+				}
+
+				server._factorioDir = path.join("test", "file", "factorioDownload");
+				server._targetVersion = "latest";
+				global.fetch = _fetch;
+				await fs.emptyDir(server._factorioDir);
+				await server.checkForUpdates([{
+					stable: true,
+					version: "2.0.73",
+					headlessUrl: "https://www.factorio.com/get-download/2.0.73/headless/linux64",
+				}]);
+			});
+		});
 	});
 });
diff --git a/test/integration/server.js b/test/integration/server.js
index 1035c16e..aa5eff48 100644
--- a/test/integration/server.js
+++ b/test/integration/server.js
@@ -5,14 +5,14 @@ const fs = require("fs-extra");
 const path = require("path");
 
 const lib = require("@clusterio/lib");
-const { FactorioServer, _getVersion } = require("@clusterio/host/dist/node/src/server");
+const { FactorioServer, _getFactorioVersion } = require("@clusterio/host/dist/node/src/server");
 const { logger } = lib;
 
 const { slowTest, factorioDir } = require("./index");
 
 
 describe("Integration of host/src/server", function() {
-	describe("_getVersion()", function() {
+	describe("getFactorioVersion()", function() {
 		it("should get a version from factorio's changelog.txt", async function() {
 			function checkVersion(version) {
 				if (!/^\d+\.\d+\.\d+$/.test(version)) {
@@ -20,7 +20,7 @@ describe("Integration of host/src/server", function() {
 				}
 			}
 
-			let version = await _getVersion(path.join(factorioDir, "data", "changelog.txt"));
+			let version = await _getFactorioVersion(factorioDir);
 			if (version !== null) {
 				checkVersion(version);
 			} else {
@@ -30,7 +30,7 @@ describe("Integration of host/src/server", function() {
 					}
 
 					checkVersion(
-						await _getVersion(path.join(factorioDir, entry.name, "data", "changelog.txt"))
+						await _getFactorioVersion(path.join(factorioDir, entry.name))
 					);
 				}
 			}
diff --git a/test/lib/external/FactorioVersions.test.js b/test/lib/external/FactorioVersions.test.js
index 32b86dad..9058e6e0 100644
--- a/test/lib/external/FactorioVersions.test.js
+++ b/test/lib/external/FactorioVersions.test.js
@@ -54,12 +54,12 @@ describe("FactorioVersions", function() {
 				{
 					stable: false,
 					version: "2.0.73",
-					headlessUrl: "www.factorio.com/get-download/2.0.73/headless/linux64",
+					headlessUrl: "https://www.factorio.com/get-download/2.0.73/headless/linux64",
 				},
 				{
 					stable: true,
 					version: "2.0.72",
-					headlessUrl: "www.factorio.com/get-download/2.0.72/headless/linux64",
+					headlessUrl: "https://www.factorio.com/get-download/2.0.72/headless/linux64",
 				},
 			]);
 		});
@@ -90,7 +90,7 @@ describe("FactorioVersions", function() {
 				{
 					stable: true,
 					version: "2.0.73",
-					headlessUrl: "www.factorio.com/get-download/2.0.73/headless/linux64",
+					headlessUrl: "https://www.factorio.com/get-download/2.0.73/headless/linux64",
 				},
 			]);
 		});