dude your in luck Whirlwind:
The fourth patch was released on March 5, 2009 bringing the game up to version 2.0. The patch fixes various bugs and issues as well as making other changes, such as better AI behavior, revamped User Interface and achievements on the Steam version of the game. The "Titan Pack" was released simultaneously with the fourth patch, adding large amounts of new content, including 16 new maps, new vehicles, new weapons and two new game types. The game was re-released on Steam under the name Unreal Tournament 3 Black, and accompanied by a time-limited price reduction and free weekend to publicise the game. Also, a non-Steam purchased version of UT3 can now be activated with Steam by using an existing CD Key, making it a full Steam version.
so go to add game and just input the CD and presto!