So, I bought an extra copy of the game at launch which I gave to my brother to use (I'm on PC), but he doesn't play the game anymore and I can't find the original box. If I want to upgrade to the PS4 version for a friend to use while he visits, does my brother have to use his Squeenix account from his PS4 profile, or can I use my own Squeenix account with my PS4 profile? And do I need to have the PS3 registration code in either case?