Diehard,
This is getting more complicated than I intended

. OK, I've already downloaded and installed all S3TC Hi-End textures for both Unreal and UT, dated March 7, 2010. Both games and configured correctly and running properly. Also, I'm a single player.
Now, I want to install the UT S3TC Hi-End textures into Unreal, as you suggested. I already have those textures on-hand archived on CDs.
Now, can you answer my prior posted questions, as follows:
Should I install only those S3TC UT textures with names different than those S3TC textures already installed in Unreal?
For example, if Unreal already has the S3TC texture named Mine.utx, then I wouldn't install the S3TC UT texture with the same name, right?
Also, if an UT S3TC texture has a name that doesn't exist in Unreal, then would I install it in Unreal anyway? I suppose such conditions exist, but I don't know for sure. Just asking.
OK, your last post answered the last question: I may have a few extra textures, but that fact doesn't matter (if I have the space).
Do these issues make sense?
Freddy