that can help me install on ut2004 please kf :'(
1. Download: http://www.moddb.com/mods/killing-floor/downloads/killing-floor-252-zip-archive/
2. Extract the archive to UT2004 directory.
As a result you should have
"KFMod20" folder inside your UT2004 folder. You can start the mod by running "Play KF.bat" which is located inside KFMod20 folder.