I'm puzzled. The website now states system requirements as: Mac OS X Mountain Lion 10.8.54 or later Mac OS X Lion 10.7.65 or later Um, I have neither of those versions on my systems. A little clarification from Parallels is in order.
The system requirements are: OS X Mavericks 10.9.3 or later Mac OS X Mountain Lion 10.8.5 or later Mac OS X Lion 10.7.6 or later
Um, 10.7.5 It is unlikely that Apple will be releasing a significant point upgrade to 10.7 at this point.