diff --git a/index.js b/index.js
new file mode 100644
index 0000000..c0a1680
--- /dev/null
+++ b/index.js
@@ -0,0 +1,138 @@
+const fs = require("node:fs");
+const https = require("node:https");
+const path = require("node:path");
+const child_process = require("node:child_process");
+const checksum = require("checksum");
+
+const manifestURL = "https://cdn.plutonium.pw/updater/prod/info.json";
+
+var basePath = path.join(process.env["LOCALAPPDATA"], "Plutonium");
+
+function httpsGet(url) {
+	return new Promise(function (resolve, reject) {
+		var request = https.request(url, function (response) {
+			var body = "";
+
+			response.setEncoding("utf-8");
+			response.on("data", function (chunk) {
+				body += chunk;
+			});
+
+			response.on("end", function () {
+				resolve({
+					"status": response.statusCode,
+					"headers": response.headers,
+					"body": body
+				});
+			});
+		});
+
+		request.on("error", function (error) {
+			reject(error.message);
+		});
+
+		request.end();
+	});
+}
+
+function httpsDownload(url, filePath) {
+	return new Promise(function (resolve, reject) {
+		var fileDirectory = path.dirname(filePath);
+
+		if (!fs.existsSync(fileDirectory)) {
+			fs.mkdirSync(fileDirectory, {
+				"recursive": true
+			});
+		}
+
+		var fileWriter = fs.createWriteStream(filePath);
+
+		var request = https.request(url, function (response) {
+			var body = "";
+
+			response.pipe(fileWriter);
+
+			response.on("end", function () {
+				resolve();
+			});
+		});
+
+		request.on("error", function (error) {
+			reject(error.message);
+			fileWriter.close();
+		});
+
+		request.end();
+	});
+}
+
+function checkFiles(manifest) {
+	var filesToDownload = [];
+
+	for (var f = 0; f < manifest.files.length; f++) {
+		var file = manifest.files[f];
+		var filePath = path.join(basePath, ...(file.name.split("/")));
+
+		if (!fs.existsSync(filePath)) {
+			console.log("File " + file.name + " needs to be downloaded. ");
+			filesToDownload.push(file);
+			continue;
+		}
+
+		var sum = checksum(filePath, {
+			"algorithm": "sha1"
+		});
+
+		if (sum !== file.hash) {
+			console.log("File " + file.name + " needs to be downloaded again. ");
+			filesToDownload.push(file);
+		} else {
+			console.log("File " + file.name + " doesn't need to be downloaded again. ");
+		}
+	}
+
+	return filesToDownload;
+}
+
+async function downloadFiles(baseURL, files) {
+	for (var f = 0; f < files.length; f++) {
+		var file = files[f];
+		var filePath = path.join(basePath, ...(file.name.split("/")));
+
+		console.log("Downloading file " + file.name + "...");
+
+		await httpsDownload(baseURL + file.hash, filePath);
+	}
+}
+
+function launchLauncher() {
+	console.log("Launching the launcher ! ");
+
+	var launcherPath = path.join(basePath, "bin", "plutonium-launcher-win32.exe");
+
+	var subprocess = child_process.spawn(launcherPath, [], {
+		"detached": true,
+		"stdio": "ignore"
+	});
+
+	subprocess.on("spawn", function () {
+		subprocess.unref();
+	});
+}
+
+console.log("Getting manifest...");
+httpsGet(manifestURL).then(async function (response) {
+	try {
+		var data = JSON.parse(response.body);
+
+		var wrongFiles = checkFiles(data);
+		if (wrongFiles.length > 0) {
+			console.log("We have " + wrongFiles.length + " files to download");
+			await downloadFiles(data.baseUrl, wrongFiles);
+		}
+
+		await launchLauncher();
+	} catch (error) {
+		console.error(error);
+	}
+});
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..4a8f454
--- /dev/null
+++ b/package.json
@@ -0,0 +1,11 @@
+{
+  "dependencies": {
+    "checksum": "^1.0.0"
+  },
+  "name": "open-plutonium-updater",
+  "version": "0.0.1",
+  "main": "index.js",
+  "author": "X3F200C",
+  "license": "MIT",
+  "private": true
+}