There is a difference between OEM versions of Windows and full retail versions of Windows. (techspot.com)
Although the new Hitman game won't be available in full retail version until January 2017, the episodes have already been released as a series of downloads for PC, PlayStation 4 and Xbox One in a bid to iron out any faults before its disc release and create a game that truly develops with players. (gamergeddon.com)
completely agree with the article... sony hype DriveClub PlayStation Plus edition to the point that they are the firm who cares about their fans but right at the last moment delayed it release but went ahead with full retail version release.... (n4g.com)