Try to keep up the concurrent downloads

src/update.js

@@ -57,12 +57,31 @@ function downloadFile(url, filePath) {
 	});
 }
 
-function processDownloadQueue(baseDirectory, fileEntries) {
+function processDownloadQueue(baseDirectory, baseURL, fileEntries) {
 	return new Promise(function (resolve, reject) {
 		let runningDownloads = 0;
+		let queue = [...fileEntries];
+
+		let finishCallback = function () {
+			if (queue.length > 0) {
+
+			}
+		};
 
 		for (let d = 0; d < module.exports.concurrentDownloads; d++) {
+			if (queue.length < 1) break;
 
+			let currentEntry = queue.shift();
+
+			downloadFile(baseURL + currentEntry.hash, path.join(baseDirectory, currentEntry.name)).then(finishCallback).catch((function (error) {
+				if (!this.retries) {
+					this.retries = 0;
+				}
+				if (this.retries > 3) return reject(error);
+
+				this.retries++;
+				queue.push(this);
+			}).bind(currentEntry));
 		}
 	});
 }
@@ -86,9 +105,9 @@ module.exports = {
 			});
 		});
 	},
-	"downloadFiles": function (baseDirectory, fileEntries) {
+	"downloadFiles": function (baseDirectory, baseURL, fileEntries) {
 		return new Promise(function (resolve, reject) {
-			processDownloadQueue(baseDirectory, fileEntries.filter(function (entry) {
+			processDownloadQueue(baseDirectory, baseURL, fileEntries.filter(function (entry) {
 				return !entry.ok;
 			})).then(function () {
 				resolve(true);