[klingonopera]

If you can get your hands on the very first, unpatched version, it should work. I got that to run in an offline LAN setting.

EDIT: I remember now what the problem was, running a co-op local game. They'd allow you to do a LAN game, but not with bots. A friend of mine played it locally in single-player, and I'd use my online account to connect with IP, a button which was only unlocked if you used an online account. You may be able to work around it by specifying the IP address to connect to in the windows shortcut for launching the game.

EDIT2: I may or may have not been using a crack at the time, not sure if that has anything to do with requiring an online connection...