worked for me, just disable automatic updates and RUN as ADMINISTRATOR!!!! this only works for singleplayer as far as im aware, double check to make sure you downgraded to your backup on ragehook, you should be patrolling again in no time! :) hope it works
U must of not made a rage hook backup when you installed, i dont know what else to say, possible try to torrent or crack 573? theres links out there, as far as im aware, just put the GTA5.exe and LaunchGTA5.exe in your main directory and your game will think its on 573. I hope it works!