unless someone has said that a particular ut2k3 mod will work in 2004, do not try to install it in UT2k4. The base code in 2004 changed ever so slightly so that mods made for ut2k3 will not work in ut2k4 in general if the include new weaponfire's, weapons, pawns, or player controllers. Also to get ut2k4 to realize that it has a new mod available, special mod listing files(.ucl s) have to be added. Is that what you were asking?