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Can't install older version software OSX via partitions on High Sierra

I have done some digging via google and can't get a good answer.


I have obtained an iMac 2011 that came installed with HS. I partitioned the drive so I can install older OSX versions. I erased the partition and did it as Mac OS journaled. I can't get anything but HS to install. I get an error message when I try El Capitan or anything lower.


Is this not possible or is there another way to erase the disk space to take a previous OS?


Cheers!

Posted on Apr 4, 2021 6:13 PM

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Posted on Apr 4, 2021 7:02 PM

You could create a USB bootable installer of El Capitan, boot from it then install it to the new partition. Why you would want to I don't know since neither High Sierra nor El Capitan are supported.

How to create a bootable installer for macOS - Apple Support

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Can't install older version software OSX via partitions on High Sierra

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