I bought a digital copy of FFX|V a few weeks ago, loaded it on my old computer and played for a bit (level 10!). I was busy the next few days after that then got a new computer. I assumed I could just load up the client on my new machine and get back to playing on my old character. When I downloaded the setup file and ran it it asks for my registration info. I entered it and got an error about how this code was already used.

My question is: can I not use the copy I bought anymore? The old computer is gone or I would just use that for now. Do I really need to buy a new copy to play on a different machine? I opened an email ticket with SE but they have not responded other than to say they would get to me in 2 business days (4 business days ago...).