Advice on version to use
I installed the Emohawk bundle and got it working. It seemed like it would do what I minimally needed, but I couldn't work out how to get the UE2 runtime to connect to a remote server (so students could connect from their computers to my server to interact with the bots).
Would UT2004 be a better choice? I think that's still a for-pay product, though, which probably lets it out for my purposes in a computer lab.