The Fritzbot51.zip file you have requested: Modifications / Mini mods / Fritz Bot / RtCW Fritz Bot v0.51 - 1.85mb is not available. Perhaps try browsing all files for the game Return To Castle Wolfenstein and upload any files you want to share or are missing. This is the only information we could locate:
If you don't have Fritz, then download the FritzBot51.zip and extract it into your wolf directory. Further instructions are provided in the readme, and in the user's guide. There are a load of bug fixes, some new features, and a new map "SF_COBRA" in this release.