How do you...
When you download a mod or map or whatever it is where do you put it to get them to work?
Do you mean downloading it from a web page or while entering a server? In the first case you need to follow instructions on the zip file or manually put things in their place like this :
'*.u' files go to '...\UT2003\system\' folder
'*.ut2' files go to '...\UT2003\Maps\' folder
'*.utx' files go to '...\UT2003\Textures\' folder
'*.uax' files go to '...\UT2003\Sounds\' folder
'*.umx' files go to '...\UT2003\Music\' folder
'*.ukx' files go to '...\UT2003\StaticMeshes\' folder
'*.uvx' files go to '...\UT2003\Animations\' folder
If you mean the second case then you need some kind of utlility to remove or move to proper location the files in the cache dir. I made one (in my signature) but you can get some other available that do the same.
I figured it out a long time ago, but thanks for the help