Epic Games have released the latest beta version of the Unreal Development Environment (UDE), all .UC uscript source files for the retail release of UT2003, and precompiled "Debug" .U's. This should be everything you need to make script mods for UT2003. When using the "Debug" .U's, please make sure you keep a backup copy of your originals. They are not compatible online and do effect performance and also added the missing .BMP file for the debugger. Please place this file in your /HELP directory.
Download UT2003 UDE - UScript And Debug .U's