Even with the SKIDROW/Fitgirl combo, you might hit issues. Here are fixes:
The is digital preservation. It is the Rosetta Stone for this game. Fitgirl simply makes that preservation easier to store on your external hard drive. Assassins Creed Revelations-SKIDROW Fitgirl Repack
This guide provides a comprehensive overview of Assassin's Creed: Revelations Even with the SKIDROW/Fitgirl combo, you might hit issues