If your current operating system is os x lion (10.7), you can skip a few versions, and upgrade directly to macos high sierra. macos mojave can upgrade high sierra, sierra, el capitan, yosemite, mavericks or mountain lion macos high sierra can upgrade sierra, el capitan, yosemite, mavericks or mountain lion safari downloads the following older installers as a disk image named or apr 15,.Download el capitan: support.apple en us ht206886download high sierra: support.apple en us ht2089692020 method: how to upgrade from l. make a fresh install of high sierra using a (second) external flash drive. apple website, and not the app store) backup your files, and make a fresh install of mountain lion using an external flash drive (many tutorials online). Download buy mountain lion 10.8 from apple (i.e.
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