Download failure error.

OpenRA.Mods.Common/Widgets/Logic/Installation/DownloadPackageLogic.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Net;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
@@ -33,6 +34,9 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 		[FluentReference]
 		const string UnknownHost = "label-unknown-host";
 
+		[FluentReference]
+		const string DownloadFailed = "label-download-failed";
+
 		[FluentReference("host", "received", "suffix")]
 		const string DownloadingFrom = "label-downloading-from";
 
@@ -181,6 +185,12 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 
 						var response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, token);
 
+						if (response.StatusCode != HttpStatusCode.OK)
+						{
+							OnError(FluentProvider.GetString(DownloadFailed));
+							return;
+						}
+
 						using (var fileStream = new FileStream(file, FileMode.Create, FileAccess.Write, FileShare.ReadWrite, 8192, true))
 						{
 							await response.ReadAsStreamWithProgress(fileStream, OnDownloadProgress, token);