Fix installing ra from disk

OpenRA.Launcher.Mac/Controller.m

@@ -65,7 +65,7 @@ extern char **environ;
 - (void)installRAPackages:(NSArray *)args
 {
 	// Todo: check if we can write to the requested dir, escalate priviledges if required.
-	NSArray *a = [NSArray arrayWithObjects:@"--install-ra-packages-inner", [args objectAtIndex:2], nil];
+	NSArray *a = [NSArray arrayWithObjects:@"--install-ra-packages-inner", [args objectAtIndex:2], [args objectAtIndex:3], nil];
 	[self runUtilityWithArgs:a];
 }
 

OpenRA.Utility/Command.cs

@@ -70,7 +70,7 @@ namespace OpenRA.Utility
 				Console.WriteLine("Status: Extracting {0}", file.ToLowerInvariant());
 				File.Copy(
 					Path.Combine(fromPath, file),
-					Path.Combine(toPath, file.ToLowerInvariant()), true);
+					Path.Combine(toPath, Path.GetFileName(file).ToLowerInvariant()), true);
 			}
 
 			Console.WriteLine("Status: Completed");