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This product isn't what it seems. In effect, if you buy this item, you are buying a subscription to use this product until approximately October, 2016. At that time, Apple will update its operating system and Parallels 10 will stop working. You will either need to buy Parallels 12 or you won't be able to run Windows at all. Parallels Software has a purposeful limitation which kills the operability after no more than 24 months. At the very least, PARALLELS SHOULD HONESTLY AND CLEARLY ADVERTISE THIS PRODUCT AS A SUBSCRIPTION, BUT THEY DON'T. They will argue that they are a small development team, and need to focus on new innovation. But, that is just a convenient excuse to require that all of their users to buy their product every couple of years. I can't believe that almost all Mac developers are able to figure out how to keep their legacy software operable, except for Parallels. When was the last time you bought a program that just stopped working when OSX is updated? It's rare for me, but, for Parallels, it's their business. There are plenty of alternatives to Parallels you should consider if you don't want to pay to upgrade all the time. UPDATE: I just got the below note from Parallels as I am running Parallels 9. As you can see, even though I bought this software less than 2 years ago, they've made it so that I can't upgrade my Mac to El Capitan without buying a new version of Parallels. If you are planning on installing OS X El Capitan (10.11) public beta please note that Parallels Desktop 9 for Mac does NOT support OS X El Capitan. Before you install OS X El Capitan public beta, be sure to upgrade to Parallels Desktop 10 for Mac. It is our latest version that addresses known El Capitan compatibility issues. BONUS: When you upgrade to Parallels Desktop 10 you automatically qualify to get our next version of Parallels Desktop at no additional cost to you.