So basically, I have GTA V on steam up to date. But when I run FiveReborn, it requires me to update 500MB, Why do I need to update when I'm already updated with the official updates.
When u download the installer. It just gives you the basic version of fivereborn. However there would still be some updates to it.
Just update it and you should be fine.
Cause it will download you local content. Second to that, you need the client itself.