UpdateProvider will delete update package after installation.

NzbDrone.Update.Test/UpdateProviderStartFixture.cs

@@ -143,6 +143,9 @@ namespace NzbDrone.Update.Test
             Mocker.GetMock<DiskProvider>()
                 .Setup(c => c.CopyDirectory(UPDATE_FOLDER, TARGET_FOLDER));
 
+            Mocker.GetMock<DiskProvider>()
+                .Setup(c => c.DeleteFolder(UPDATE_FOLDER, true));
+
             Mocker.Resolve<UpdateProvider>().Start(TARGET_FOLDER);
         }
 

NzbDrone.Update/Providers/UpdateProvider.cs

@@ -79,6 +79,7 @@ namespace NzbDrone.Update.Providers
             try
             {
                 _diskProvider.CopyDirectory(_enviromentProvider.GetUpdatePackageFolder(), targetFolder);
+                _diskProvider.DeleteFolder(_enviromentProvider.GetUpdatePackageFolder(), true);
             }
             catch (Exception e)
             {