maybe:
https://www.reddit.com/r/unrealtournament/comments/106z3du/where_to_find_ut_99_or_2004_now/

Hello! Question about the technical part. When I play with a video card, I have very thick shadows (just darkness) and very bright textures, it hurts my eyes. The image also jumps and sometimes you can’t hit a motorcycle at point-blank range with a rifle, but this could be a ping. This didn’t happen on the graphics chipset, what can you recommend? Thank you

Another option is to back up your cache folder and delete all maps from the cache, then you join the server when it is empty and choose the maps you want to download, then you will know which maps are in your folder. Some maps won't work (due to a missing file, etc.), you'll have to open it with the unreal editor and save, at least that's what I did

Thanks i'll give it a go 

https://github.com/EliotVU/UT2004-MutCacheExtractor

Works like a charm.