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Big Sur to Older OS

Hey, Does anybody know how to go from Big Sur to some old operating system like Mojave, Sierra etc.

Because when I tried to open the "Mojave Installer" It said that that operating system is too old or something. Then Catalina. It also said it was too old. I dunno what to do about that.


This is the text that appears :


This copy of the “Install macOS”

application is too old to be opened on this version of

macOS.

Posted on Feb 8, 2021 12:07 AM

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Question marked as Top-ranking reply

Posted on Feb 8, 2021 2:01 AM

One can Not install an Older version of macOS ( Sierra, Mojave, Catalina ) on top of the Newest version of macOS Big Sur. The only way to achieve this is to Erase the existing version of macOS and install the older version.


Is this a Brand New computer with the new Apple Silicon M1 chip or Intel ? If Apple Silicon M1 - it came with Big Sur and there is no other macOS the can be installed on it.


Notation: One must determine the Age of the machine >> About this Mac << from Desktop Icon. Then an only then can we determine just how far back the machine can go versus macOS.

3 replies
Question marked as Top-ranking reply

Feb 8, 2021 2:01 AM in response to The_Train_Enthusiast

One can Not install an Older version of macOS ( Sierra, Mojave, Catalina ) on top of the Newest version of macOS Big Sur. The only way to achieve this is to Erase the existing version of macOS and install the older version.


Is this a Brand New computer with the new Apple Silicon M1 chip or Intel ? If Apple Silicon M1 - it came with Big Sur and there is no other macOS the can be installed on it.


Notation: One must determine the Age of the machine >> About this Mac << from Desktop Icon. Then an only then can we determine just how far back the machine can go versus macOS.

Big Sur to Older OS

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