The update also adds French, Italian, German, and Spanish language support, additional audio support options, and addresses 'a number of menu and gameplay issues for a number of different screen sizes.' Unfortunately, this part of the update does not appear to have gone flawlessly.
None of these solutions are ideal for someone looking for a simple hour or two of classic online gaming, but now there's a better way: A surprise update has restored multiplayer support directly through Steam. As this guide on Steam breaks down, you could use a mod, or do some manual hex editing, or you could hoof your PC over to somebody's basement and set up a LAN with as many people as you could squeeze in.
It was still possible to play online but it took a lot more effort after that happened.