All SVN info can be found in the forum's SVN Stuff area.
http://forums.ulyssesmod.net/index.php/board,26.0.htmlThough direct links for ulx and ulib are the only ones provided, replace one of them with UPS instead and you have the URL.
Make sure you use upper case for the UPS
Also, svn UPS requires svn ULib which, if you use ULX, will mean you need to upgrade to SVN ULX.
Backup your server's gmod/data/ULib folder before upgrading.
Heed the warning of the SVN access info thread.
If you're not already using ULib/ULX SVN and aren't ready to accept the responsibility of beta software, please don't upgrade.