macOS is a series of graphical operating systems developed and marketed by Apple Inc. since It is the primary operating system for Apple's Mac family of computers. Versions from Mac OS X Lion () run exclusively on bit Intel . In two succeeding versions, Lion and Mountain Lion, Apple moved some . OS X Mountain Lion (version ) is the ninth major release of OS X (now named macOS), Apple Inc.'s desktop and server operating system for Macintosh computers. Mac computers with Metal-capable graphics processors (GPUs) can be upgraded to Then, if your Mac is running OS X Mountain Lion or later, you can. mountain-lion apple-os-x-mountain-lion OS X Mountain Lion is an operating system developed by Apple Inc. for it's own line (Macintosh) of computers. OS X. Download Mac OS X Mountain Lion DMG File Installer for version Free download and experience Apple’s OS X 9th edition with brand new features. Mac OS X Mountain Lion: Product’s Salient Features. Well OS X Lion is not available in the Mac App Store but you can direct download Mac OS X Lion from pethydro.orger, This is an official App Store installer. Apple OS X Mountain Lion – Using the on-screen keyboard keyboard can be used instead of a physical keyboard to interact with your computer. You can. OS X Mountain Lion is Apple's best OS yet. . I used this as my main operating system on my business computer until upgrading to new versions of Mac OS. If you need to purchase Mac OS X Mountain Lion, you may order it from this page. The current version of the Mac operating system is macOS Mojave. Apple OS X Mountain Lion – Changing keyboard settings 'Slow Keys' enable you to tune the amount of time the computer waits, whilst you are holding a.