Like a lot of people I have both a desktop (iMac) and laptop (MacBook Pro) that I need to be able to use Parallels on. I'm currently using PD8, but am aware that I ought to upgrade to PD10 for Yosemite - which was released today. Pretty much every piece of software I have lets me install on two computers that I own. Even Adobe's Creative Cloud makes this concession. Is it seriously the case that Parallels does not let you use/licence/activate PD on more than one computer? I won't be using both at the same time, and I own both pieces of hardware. Considering the cost of the upgrade - which is not trivial - I'd like to know the answer to this before I throw money down the drain.