I'll have to plead the 5Th on that question. The friend passed away some time ago so I can't ask him where he got the download but, I imagine, he paid to download it from some site like eBay. There are many programs there that vendors advertise a digital download for. They place no limitations on the installations that can be made from that download.
I have a hard copy of Creator 2012 that I bought some time ago and have since installed it on a number of different machines. I would think that the same would hold true for a downloaded version.
But then, thinking is not my strong suit.