OpenEmu is about to change the world of video game emulation. Virtual PC for Mac This software lets you run Windows software GameCube and Wii games emulator for Mac 6. STEP 1: Download macOS High Sierra The full operating system is a free download for anyone who has purchased Mac OS X Snow Leopard, Lion, or Mountain Lion or has a Mac preloaded with OS X Mavericks, Yosemite, El Capitan, or macOS Sierra.