There's plenty of bypasses. For example. start gta normally > close it with task manager > When the error screen with ''run safe mode'' or ''retry'' don't do anything, just open your gta folder and replace GTAV.exe and update.rpf with the lower version one and the press ''retry''
If you want to be extra sure, place your ''normal'' files somewhere else. (a copy)
This is just if you already have the old files.