Indeed, which is why I'm rather surprised I can download it here on the work machine (32-bit) on steam (entire thing downloaded in under an hour. Fibre ftw!

). I've had trouble in the past with 64-bit games not wanting to download on a 32bit machine (even tho i just copy to external drive, thanks again MyGaming!, and play at home). Ark didn't wanna download, and 1 or 2 others.
But yea, think its actually a good idea to wait a week and then mod the crap out of it and THEN start playing
