I totally agree with Bert Austen on this. Very nice when it worked, but totally stuffed up my game even with the new unpack files. Worked well initially but I am not willing to go through these pains each time an update comes out.
DO NOT DOWNLOAD THIS MOD!!!!!
I have tried EVERYTHING to get my PCars working again. I uninstalled the game, deleted all references to it in the Windows registry, deleted the documents folder and downloaded it again. I may have to reload windows as a whole just to get this sorted out. It F@#$ed up my entire installation beyond recovery. Even using the uninstall.bat that the mod comes with does not work.
If you want mods...stick with Assetto Corsa or Rfactor.