to do this you must unzip any download save, open up xsavsig and change the sig of the userprofile.xml, garage.dat, garage.bin,ect.. to do this just load the file you want, put the sign option on either forza motorsport, Forza Motorsport Garage.bin/Garage.dat, Forza Motorsport Texture File, or Forza Motorsport Package File(which ever you are trying to get to work on your xbox)and click apply.take the newly signed file and out it in your non-xbl forza save folder that you unzipped(overwriting the old file) and rezip it. Than use XSaveMgr to put it back on your xbox.
Hmm, I still dont quite follow. So, do I have to take every single file out of the downloaded save zip and run it through the xsavsig program? For instance, the save I downloaded has;
Also, how do I know which sign option to select when/if I am selecting one of these?