The files you find here are for UT2004 and they MAY or MAY NOT work.  Winkyboy no longer has time to test them all, as he's barely found time to even index them any more.  But most of them work, and some of those that do are really worth downloading.  Winkyboy would like to convert HIS creations to UT3, but currently hopes to find time to implement a much grander-scale vision that is currently beyond his abilities.