Question about the Mac version

[Kairobot]

I think that if you install the game on your Mac and log in as usual there is no problem. Only issue I see is if you want the free 30 day trial you get for putting in the registration code which I think is likely not possible with an old account. Also, rumor has it that the Mac version uses a wrapper and does not run on native iOS.

Edit: In addition, I think you would also need to buy the HW expansion and register that to your old account if you want to use your old account to play HW on the Mac version.