Unreal Tournament 2003 simply doesn't work...

Hi, After my several unsuccessful tries, now based on info from the web I managed to install UT2003 on SUSE Linux 10.0. (Yes, original German box, containing 3CDs, reg. code, etc.) I was extremely happy to see it on the harddisk, but running it as user (or even root) resulted the same error message: agika:~ # ut2003 C++/ Script class size mismatch History: Exiting due to error agika:~ # When running it not from console, but e.g. from K-menu resulted the splash of the game came up for few seconds, then disappeared... I'm very disappointed now, but didn't find any corresponding info on Google how to get the game up and running. Please, did anyone overcome this kind of annoying error?! Thanks, Pelibali