I know I just posted the message above, but I found a solution.
Open the folder: Documents / Rockstar Games / GTA V / Profiles / (your profile number) and delete the last saves. They should look like: SGTA5...., look after the latest modification date. When you go back in, just press "Skip all" if Steam (I don't know if it is the same with Rockstar) asks you if they should use your deleted save. Then just try launching RagePluginHook and see if it works.
Remember, never save the game when you are on duty!
I hope this post was clear enough to follow.