Use the specifically created progress action, add license header.

osu.Game/Online/API/Requests/DownloadBeatmapSetRequest.cs

@@ -1,4 +1,7 @@
-using osu.Game.Beatmaps;
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Beatmaps;
 using System;
 
 namespace osu.Game.Online.API.Requests

osu.Game/Overlays/Direct/DirectPanel.cs

@@ -60,13 +60,7 @@ namespace osu.Game.Overlays.Direct
                     Logger.Error(e, "Failed to get beatmap download information");
                 };
 
-                downloadRequest.Progress += (current, total) =>
-                {
-                    float progress = (float)current / total;
-
-                    progressBar.Current.Value = progress;
-
-                };
+                downloadRequest.DownloadProgressed += progress => progressBar.Current.Value = progress;
 
                 downloadRequest.Success += data =>
                 {