Computer Change

I ordered the pre-order version of the game and downloaded it onto my computer. However, since then I purchased a new and better computer. I want to play on this computer as my old computer is not good enough for this game.

However, the launcher will not let me play the game. The launcher asks me if I have a a character or not (I obviously do) but after logging in it demands my registration code and will not accept the registration code that I used on my other computer. It says that it is invalid.

How can I get this game to work on a different computer?

There should be a option once you install it to select to log into a existing account, cause code linked to you account and not the computer.