Feel cheated! This program was sold on Amazon at the offer price. My Mac has OS X operating system as Yosemite. The installation of Parallels software ran without warnings and instructions. When I wanted to start the progam I should be compelled immediately update to the purchase is more expensive than the actual software! That's a joke because without this update no use is possible. Unfortunately, the product key to install I was used and I'm not sure if I get the refund for the return. HANDS OFF!