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Downgrading IMac OS from Catalina to Sierra

I recently purchased a 2019 21.5" IMac and want to use my late 2013 21.5" IMac as a second display.

However, my 2013 IMac OS is upgraded to Catalina and I understand support for target display mode was eliminated after Sierra. I've read several older posts about downgrading operating systems but I cannot find a link or anything that helps me get access to SierraOS.


Is this still possible?



iMac 21.5″, macOS 10.15

Posted on Dec 3, 2020 1:18 PM

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How to get old versions of macOS - Apple Support

Posted on Dec 3, 2020 2:34 PM

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Downgrading IMac OS from Catalina to Sierra

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