Do you have a link for this mod ? I can already tell you that, if it's trying to override the Playerpawn, it will conflict with UTPure.
How to feck up a perfectly good game:
UT (1999) = UnbelievableGameSoCoolIMustHelpBringNewPlayers Tournament
UT (2008) = Unreal ThrustMyPrivatePartsInYourFaceBish
And that's probably why UTIII was a relative flop. New game, same sh*thead players ^^.