Firstly, there's only ONE person developing CarBall, me. There are no other people on the development team
If you are having problems installing UMod files because you have a warez copy, or if UT2004 messed up the association on installing, try this..
-Copy the umod file to your UT2004\System folder.
-Open a DOS command prompt and CD to the UT2004\System folder.
- type the following command..
Setup install <filename>
That should install the UMod