Parallels Desktop 12 for Mac System Requirements: Any Mac computer running macOS Sierra 10.12, OS X El Capitan 10.11.5, OS X Yosemite 10.10.5, or newer 4 GB of memory (8 GB recommended) 850 MB of disk space on the boot volume (Macintosh HD) for Parallels Desktop installation Additional disk space for virtual machines (SSD drives recommended for better performance) Internet connection required for product download, activation, updates, and select features Requires Windows or other operating system (not included)