Question about the Mac version

[Kairobot]

I don't think there should be a problem downloading the game after purchasing it from the SE store if you put it on a separate partition or hard drive. I've had JP and NA versions of FFXI on separate partitions and played that game for years. Once you have downloaded the game, anyone with a new or old account can log in. I actually have FFXIV running beautifully on bootcamp on my Mac but I mostly play on my PC. I guess you could install your windows version on a bootcamp partition (or separate partition/hard drive) and the new Mac version on your usual iOS partition.