I need to use an application that needs Mountain Lion and is not yet compatible with Sierra which I upgraded to. How do I go back to Mountain Lion?

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    by turning off your laptop and turning back on by holding down on the command button while holding down the r button at the same time. while your in the recovery mode click on ulitiy disk and erase HD macinoch hard drive so that way you can go back to your mountion lion application.

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  • I have a similar problem and I plan to partition my hard drive and re-install Mountain Lion in its own partition. Then I can choose to boot up in either Mountain Lion or Sierra. While in Mountain Lion, I then plan to plug in my back-up disk and *hope* the old applications will run from their previous back ups. Don't know for sure if this is going to work, but it's worth a try. It would cost me a fortune to switch from my older versions of Adobe Photoshop and Word to the newer versions...wish I had thought of that before upgrading. I never even wanted to upgrade, I liked my system the way it was, but was forced into the upgrade because Chrome and Safari no longer supported my OS. :(

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  • If your mac was shipped with Lion(2011), you can do Internet Recovery (Immediately after hearing the Mac boot chime, hold down Command+Option+R). It will install the original OS that your computer was shipped with. I hope yours came with Lion

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