Check if removed files actually exist when updating

DepotDownloader/ContentDownloader.cs

@@ -1014,15 +1014,21 @@ namespace DepotDownloader
                     {
                         // Delete it if it's in the old manifest AND not in the new manifest AND not in any of the previous depots.
                         var newManifestFile = filesAfterExclusions.SingleOrDefault( f => f.FileName == file.FileName );
+                        if ( newManifestFile == null )
+                            continue;
+
                         var previousFile = previousFiles.SingleOrDefault( f => f.FileName == file.FileName );
-                        if ( newManifestFile == null && previousFile == null )
+                        if ( previousFile == null )
-                        {
+                            continue;
+
                         string fileFinalPath = Path.Combine( depot.installDir, file.FileName );
+                        if ( !File.Exists( fileFinalPath ) )
+                            continue;
+
                         File.Delete( fileFinalPath );
                         Console.WriteLine( "Deleted {0}", fileFinalPath );
                     }
                 }
-                }
 
                 // Remember files we processed for later.
                 previousFiles.AddRange( filesAfterExclusions );