Square Enix seems to be treating them like separate games at times, but also calls them just fixing the old one. I can't find any conclusive evidence on this. What do I need to do to play?
Update:
I try logging into the website to download the client, and it says I need to sign in to the game first. I can't sign in to the game until I have the client installed, but my disks are for the old client. Where do I go from here?
Best Answer
If you played the original Fourteen, you already have an account, and all you need to play (even with your old character, if you like) is go to account management and subscribe.
Having Legacy status (obtained by being subscribed to the original Fourteen for three months) gives you a permanent discount on ARR subscription.
In either case, if you already had an account at ARR's release, you should have gotten two weeks of subscription for free. As of this writing, you should still have a week left: try logging into the game.