diff --git a/index.js b/index.js
index c0a1680..acacae0 100644
--- a/index.js
+++ b/index.js
@@ -2,7 +2,7 @@ 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 crypto = require("node:crypto");
 
 const manifestURL = "https://cdn.plutonium.pw/updater/prod/info.json";
 
@@ -66,7 +66,24 @@ function httpsDownload(url, filePath) {
 	});
 }
 
-function checkFiles(manifest) {
+function getFileSHA1(filePath) {
+	return new Promise(function (resolve, reject) {
+		var fileStream = fs.createReadStream(filePath);
+
+		var hash = crypto.createHash("sha1");
+		hash.setEncoding("hex");
+
+		fileStream.on("end", function () {
+			hash.end();
+
+			resolve(hash.read());
+		});
+
+		fileStream.pipe(hash);
+	});
+}
+
+async function checkFiles(manifest) {
 	var filesToDownload = [];
 
 	for (var f = 0; f < manifest.files.length; f++) {
@@ -79,9 +96,7 @@ function checkFiles(manifest) {
 			continue;
 		}
 
-		var sum = checksum(filePath, {
-			"algorithm": "sha1"
-		});
+		var sum = await getFileSHA1(filePath);
 
 		if (sum !== file.hash) {
 			console.log("File " + file.name + " needs to be downloaded again. ");
@@ -99,7 +114,7 @@ async function downloadFiles(baseURL, files) {
 		var file = files[f];
 		var filePath = path.join(basePath, ...(file.name.split("/")));
 
-		console.log("Downloading file " + file.name + "...");
+		console.log("Downloading file " + file.name + "... ");
 
 		await httpsDownload(baseURL + file.hash, filePath);
 	}
@@ -125,14 +140,28 @@ 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);
-		}
+		checkFiles(data).then(function (wrongFiles) {
+			if (wrongFiles.length > 0) {
+				console.log("We have " + wrongFiles.length + " files to download. ");
+				downloadFiles(data.baseUrl, wrongFiles).then(function () {
+					launchLauncher().then(function () {
 
-		await launchLauncher();
+					}).catch(function (error) {
+						console.error("An error has occurred while opening the launcher. \n" + error.stack);
+					});
+
+				}).catch(function (error) {
+					console.error("An error has occurred while downloading a file. \n" + error.stack);
+				});
+			} else {
+				console.log("All files seem good ! ");
+			}
+		}).catch(function (error) {
+			console.error("An error has occurred while checking the files. \n" + error.stack);
+		});
 	} catch (error) {
-		console.error(error);
+		console.error("An error has occurred while decoding the main manifest. \n" + error.stack);
 	}
+}).catch(function (error) {
+	console.error("An error has occurred while getting the main manifest. \n" + error.stack);
 });
diff --git a/package.json b/package.json
index 4a8f454..d7fac4e 100644
--- a/package.json
+++ b/package.json
@@ -1,11 +1,7 @@
 {
-  "dependencies": {
-    "checksum": "^1.0.0"
-  },
   "name": "open-plutonium-updater",
-  "version": "0.0.1",
+  "version": "0.2.0",
   "main": "index.js",
   "author": "X3F200C",
-  "license": "MIT",
-  "private": true
+  "license": "GPL-3.0"
 }