Partition Mojave HD to run Sierra

Started 3 months ago | Discussions thread
Tom_N Forum Pro • Posts: 19,170
Re: Partition Mojave HD to run Sierra

JohnNewman wrote:

I've downloaded a copy of the Sierra installer and it now sits in my applications folder.

But when I try to launch it I get the message shown below.

Message when trying to open the Sierra installer.

Is there some reason that you can't install High Sierra?

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