Subscriptions (via CC) are not platform specific, so you can use two machines with different OSs under the same plan. Perpetual licenses are locked to the OS, Adobe Customer Care can migrate them for you, but you cannot use both at once.
Dave thanks for the response and info to my question concerning Lightroom
and two different operating systems. I was almost sure that there would be
complicating issues concerning a multiple operating system installation.
Doesn't sound to complicated though. I'll give it a try as soon as I
purchase an external DVD drive for the Macbook. I tried to contact Adobe
concerning this question, but their response system is so convoluted that
it would probably be easier to mount an expedition to Mars than have
someone from that company respond to a simple question.
On Thu, Oct 30, 2014 at 2:01 PM, Dave Merchant <email@example.com>
The perpetual licensed version, like the CC version, can be used on both platforms using same serial number. The EULA states that you should only install it on two computers, one a desktop, the other a laptop. However, Adobe has no way of knowing how many installations or platforms you've installed your copy on. It's all down to user honesty/conscience.