It does work on Win 2000 (it did for me). There is a work around for it explained on the MN site.
Patches are very ez to install too. No probs if one takes a lil' time & follows instructions to enjoy a free beta expansion.
The most recent Full Patch should work for all OSes (we haven't had anyone report otherwise).. if anyone finds this the case, please let us know.
Again, we realize alittle confusion happened with the first installer, but afterwards it was more important that we produce fixes then take the time out to convert everyone to a new installer, causing even further confusion if we didn't get a chance to test it adaquately.
There is a 1.2 Full and future patches will be using this new installer which should work much better.