Tried that now, but t just closes. I hear the sirens of GTA, see the stars at the top right, then it just closes.
Edit:
@mrblicher @MattexD
I fixed it now. I used the manual installation instead of the setup. I just replaced everything with the manual installation, now it would start up.
I dont know what went wrong, even after a clean install of GTA V and then using the setup. However, it fixed my problems. Thanks for the help!