Remove addons\ulx and addons\ulib, then copy the new SVN folders there to addons.
Though the format of groups.txt and users.txt between svn and release is different, ULib will create/convert the old one.
Safest way though is from scratch if you don't have many users/groups. Just remove \data\ULib after backing it up.
Don't just back it up and then recopy over the new data files. That will break it.
Try leaving them there first and letting ULib do it's conversions.
Before running server on SVN the first time, you may wish to delete data/misc_registered.txt
Oh, and by the way, since you seem to hate FAQs so much, I wanted to point out... the answer I just answered again for you is in a FAQ.
http://forums.ulyssesmod.net/index.php/topic,3071.0.htmlI just gave more detail since you're re-installing