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How to Update My Macbook with High Sierra 10.13.6 to 10.15 ? Because there were several times I need to instal some apps, such as MO 365 was asking me requires 10.15. Please Help!

Posted on Apr 4, 2021 5:44 AM

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Posted on Apr 4, 2021 5:59 AM

See: How to get old versions of macOS - Apple Support

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