They made a thread about it saying someone who already purchased 1.0 would not be able to register the windows version again.

http://forum.square-enix.com/ffxiv/t...=1#post1013237

I know your going "WTF I didn't see that!!!!" A lot of people didn't, and I'm not telling you to not do anything about it and pay another $20. I merely telling you what happened and what you can do about it. This issue has been discussed on this support thread for days now, it is unknown if SE is going to do anything about it. Your best bet is to try to get a refund.