The UTDCv21.zip file you have requested: Tools and Utilities / Miscellaneous / UTDC v2.1 - 459.96kb is not available. Perhaps try browsing all files for the game Unreal Tournament and upload any files you want to share or are missing. This is the only information we could locate:
This is the latest of the UTDC releases, an anticheat program for UT. This version is now compatible with Windows Vista.