Version 1 is no longer available; also it is not so easy to transfer an affinity licence unless the seller is willing to give over the email address as well, because to quote affinity 'one is encoded in the other' [and you would also likely need their permission so to transfer]

but if you could get it, it should run on windows 7 service pack 1 or later

you only pay once for affinity per version - ie: once for ver1 and then for upgrade to ver2; will be same for version 3; meanwhile all the updates one bug fixes are free; no subscription

xara users should be so lucky, though of course, affinity does not do web-design...