Okay so basically a rundown on what happened (EPIC GAMES):
After GTA V's latest update I went ahead and downgraded my game. Everything worked fine, RAGE worked, LSPDFR worked. Then I went ahead and installed some vehicles (replace), police ped skins (not EUP) and new roads.
I wanted to check out all the new mods I installed in-game and all of the sudden my game crashed and gave me an error after pressing on Story Mode- so called "zlib failed call, verify game files"
I renamed mods folder to _mods and the error disappeared but the game was still crashing after pressing on Story Mode. I verified my game files (I know it was stupid) & then ScriptHookV gave me their "Game Not Supported" error so I reverted my game version within RPH's backup feature, ScriptHookV doesn't give me the error anymore, but the game starts up & then just crashes to desktop