The MediaFire link is dead, but if you search "GP79 for rFactor 2" there is a Dropbox option that is still good. Great mod - GPLaps does a great overview of the original rFactor mod at https://www.youtube.com/watch?v=KJsutez2aCs, and this is a conversion of an updated version of that mod. Individual car physics, tons of liveries -- a really well-done effort.
I had to download it from somewhere else as the link didn't seem to work :( but the mod is fantastic. Great conversion from rF1. Plenty of fun. Found that with my G27, setting the FFB multiplier to 3.32 (yes 3.32!) enhances hugely the experience... (in my opinion)
Very recommendable mod.