First, install UT from the CD. Do not select High Resolution graphics.
Next, install the 436 patch:UT 436 Patch
Next, download and install the 4 bonus packs:
Next you need Excessive Overkill:
And the 451 patch currently not recommended :
Grab some common maps:
Go into UT and use the Excessive browser (under your Mod menu) to locate all of the Excessive CTF and DM servers, add them to your favorites, and come join the fun.