How do I install DMG files on Mac? Double-click the DMG file to open it, and you’ll see a Finder window. Drag the application from the DMG window into the Applications directory to install (you may need an administrator password). How do I install Apple DMG? Double-click the DMG file to make its content available (the name will show up in the Finder sidebar), and a window generally opens also showing the content. How do I install Mountain Lion on my Mac? You simply launch the Mac App Store application, click the OS X Mountain Lion banner on the store’s main page (or search for Mountain Lion, or click this direct link), click the $19.99 button at the top of the screen, then click the Buy App button that appears. dmg to open (or mount) it on your Desktop. Look for the file called “Install OS X Mountain Lion”, Right-click and select Show Package Contents. How To Install Mountain Lion From Dmg File? go to Finder > Applications.
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