Some of the other operating systems, Liinux, etc, are free for you to use, but Windows is not free. This update does not have stacks of new features, rather overall improvements and efficiency upgrades. Install OS X Lion using Install Lion.app. If you want to install Windows, you will need to purchase that, too. Mac OS X 10.6.8 Snow Leopard is an upgrade to the previous version of OS X Leopard. Download and install Windows 8 Developer Preview right from the Parallels Wizard. Parallels does very little by itself (and does NOT come with another operating system), so you would also be installing another operating system, such as Windows, or Linux, or one of the other dozens of operating systems that Parallels supports. Mac OS X Lion OS X Mountain Lion OS X Maveriks OS X Yosemite OS X El Capitan macOS Sierra macOS High Sierra macOS Mojave Parallels Desktop version 10.4.6 or later 10.4.11 or later 10.5.2 or later 10.5.8 or later 10.6 or later 10.6.3 or later 10.6.8 or later 10.7 or later 10.7.5 or later 10.8 or later 10.9 or later 10.10 or later 10.11 or later. You DO have OS X 10.6.8 or higher, correct? What exactly is stopping the Parallels install? Are you getting an error message of some kind? There's a bunch of tutorials that can help you, at the Parallels web site: Īre you using the Parallels installer DVD for the install, or did you download the installer from parallels?