As is their way, Epic Games has now issued the updated source files for Unreal Tournament 2004 in version 3339. As usual, the two packages offer all of the .UC (UnrealScript) source files and the debug .U files, respectively.
Download: UT2004 Retail v3339 .UC sources
Download: UT2004 Retail v3339 debug .U files
News source: 3D Gamers