To GOG version there are no more patches needed. There was Patch 3.1(unofficial also called manual patch... 1a,1b,1c,1d,1e or 1f) which allowed players to join private multiplayer server instead of gamespy one after hit the internet button in game. Since both servers are gone, internet option doesn't work now and there is no reason for downloading and installing patch 3.1 since it doesn't contain any addinational features and many people said that patch contain virus...(at least antivirus software seem to find such virus in the installer).