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Up until Mac OS X 10.9 Mavericks, Apple's desktop operating system upgrades were paid: to get new features, you had to pay $ 19.99. Surprisingly, this rule persisted into 2021: Apple continued to pay support for OS X 10.7 Lion and OS X 10.8 Mountain Lion for users with older computers.
But now that has changed. On the official site, you can download both installers for free for free.
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Compatible Models:
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Unfortunately, these builds will not work for experimentation: Lion will not run on Macs that came with the version 10.8 and newer out of the box, and Mountain Lion will not work on computers that were sold with preinstalled 10.9.