Added the specific exception

osu.Desktop/Overlays/VersionManager.cs

@@ -15,7 +15,7 @@ using osu.Framework.Graphics.Textures;
 using osu.Game.Graphics;
 using OpenTK;
 using OpenTK.Graphics;
-using System;
+using System.Net.Http;
 
 namespace osu.Desktop.Overlays
 {
@@ -116,32 +116,33 @@ namespace osu.Desktop.Overlays
             try
             {
                 updateManager = await UpdateManager.GitHubUpdateManager(@"https://github.com/ppy/osu", @"osulazer", null, null, true);
-
-                if (!updateManager.IsInstalledApp)
-                    return;
-
-                var info = await updateManager.CheckForUpdate();
-                if (info.ReleasesToApply.Count > 0)
-                {
-                    ProgressNotification n = new UpdateProgressNotification
-                    {
-                        Text = @"Downloading update..."
-                    };
-                    Schedule(() => notification.Post(n));
-                    Schedule(() => n.State = ProgressNotificationState.Active);
-                    await updateManager.DownloadReleases(info.ReleasesToApply, (int p) => Schedule(() => n.Progress = p / 100f));
-                    Schedule(() => n.Text = @"Installing update...");
-                    await updateManager.ApplyReleases(info, (int p) => Schedule(() => n.Progress = p / 100f));
-                    Schedule(() => n.State = ProgressNotificationState.Completed);
-
-                }
-                else
-                {
-                    //check again every 30 minutes.
-                    Scheduler.AddDelayed(updateChecker, 60000 * 30);
-                }
             }
-            catch(Exception e)
+            catch(HttpRequestException)
+            {
+                //check again every 30 minutes.
+                Scheduler.AddDelayed(updateChecker, 60000 * 30);
+                return;
+            }
+
+            if (!updateManager.IsInstalledApp)
+                return;
+
+            var info = await updateManager.CheckForUpdate();
+            if (info.ReleasesToApply.Count > 0)
+            {
+                ProgressNotification n = new UpdateProgressNotification
+                {
+                    Text = @"Downloading update..."
+                };
+                Schedule(() => notification.Post(n));
+                Schedule(() => n.State = ProgressNotificationState.Active);
+                await updateManager.DownloadReleases(info.ReleasesToApply, (int p) => Schedule(() => n.Progress = p / 100f));
+                Schedule(() => n.Text = @"Installing update...");
+                await updateManager.ApplyReleases(info, (int p) => Schedule(() => n.Progress = p / 100f));
+                Schedule(() => n.State = ProgressNotificationState.Completed);
+
+            }
+            else
             {
                 //check again every 30 minutes.
                 Scheduler.AddDelayed(updateChecker, 60000 * 30);

osu.Desktop/osu.Desktop.csproj

@@ -137,6 +137,16 @@
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Drawing" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Net.Http.Extensions, Version=2.2.29.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>..\packages\Microsoft.Net.Http.2.2.29\lib\net45\System.Net.Http.Extensions.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Net.Http.Primitives, Version=4.2.29.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>..\packages\Microsoft.Net.Http.2.2.29\lib\net45\System.Net.Http.Primitives.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Net.Http.WebRequest" />
     <Reference Include="System.Windows.Forms" />
   </ItemGroup>
   <ItemGroup>
@@ -219,7 +229,9 @@
   <ItemGroup>
     <Content Include="lazer.ico" />
   </ItemGroup>
-  <ItemGroup />
+  <ItemGroup>
+    <WCFMetadata Include="Service References\" />
+  </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
        Other similar extension points exist, see Microsoft.Common.targets.
@@ -240,4 +252,9 @@
     <PostBuildEvent>
     </PostBuildEvent>
   </PropertyGroup>
+  <Import Project="..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />
+  <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
+    <Error Condition="!Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
+    <Error Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />
+  </Target>
 </Project>

osu.Desktop/packages.config

@@ -5,6 +5,9 @@ Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/maste
 -->
 <packages>
   <package id="DeltaCompressionDotNet" version="1.0.0" targetFramework="net45" />
+  <package id="Microsoft.Bcl" version="1.1.10" targetFramework="net45" />
+  <package id="Microsoft.Bcl.Build" version="1.0.14" targetFramework="net45" />
+  <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net45" />
   <package id="Mono.Cecil" version="0.9.6.1" targetFramework="net45" />
   <package id="Splat" version="1.6.2" targetFramework="net45" />
   <package id="squirrel.windows" version="1.5.2" targetFramework="net45" />