Is it possible to run an older OS on my Mac mini 2018 or even to dual boot?

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Is it possible to run an older OS on my Mac mini 2018 or even to dual boot?

How can I run an older OS from an external drive other than Big Sur I have installed on my Mac mini 2018?- Say Catalina.

Mac mini, macOS 11.0

Posted on Dec 14, 2020 9:37 PM

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Answer 1

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dialabrain

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Dec 14, 2020 9:57 PM in response to kreuser

You would have to create a bootable installer of Mojave or Catalina. Boot from it and install to the external drive.

How to create a bootable installer for macOS - Apple Support

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Answer 2

kreuser Author

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Dec 14, 2020 10:13 PM in response to dialabrain

Ok once I create the bootable installer, do I restart the Mac to prompt then me to enter from the external drive our will the restart automatically boot from the USB drive?

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Answer 3

dialabrain

Level 10

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Dec 14, 2020 10:15 PM in response to kreuser

It explains how to use the bootable installer on the bottom of the page I linked.

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Answer 4

dialabrain

Level 10

122,567 points

Dec 14, 2020 10:20 PM in response to kreuser

In case you meant how you boot from the external drive once you've installed macOS to it, you restart, hold the Option key and choose the external drive.

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Is it possible to run an older OS on my Mac mini 2018 or even to dual boot?

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