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Can't download or install macOS Sonoma - iMac Pro

I'm running an iMac Pro with MacOS 13.5.2 and I can't install macOS Sonoma. It starts downloading it from the Software Update area of System Settings but after a chunk of the 12.86 GB I get an error message that says "Installation failed - an error occurred while installing the selected updates."

Mac Pro, OS X 10.11

Posted on Sep 26, 2023 12:35 PM

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Question marked as Top-ranking reply

Posted on Feb 25, 2024 6:48 PM

I am on MacOS Big Sur and go to the “about this max section and from there to software update. I keep trying to update MacOS Sonoma only to after downloading 13 GB of storage being met with an installation application for Sonoma. Is this a glitch or something because this is really annoying

10 replies
Question marked as Top-ranking reply

Feb 25, 2024 6:48 PM in response to MrLatte

I am on MacOS Big Sur and go to the “about this max section and from there to software update. I keep trying to update MacOS Sonoma only to after downloading 13 GB of storage being met with an installation application for Sonoma. Is this a glitch or something because this is really annoying

Sep 26, 2023 12:56 PM in response to MrLatte

There were four different 2017 iMac models.

A standard 21.5" model that tops out at Ventura.

A standard 21.5" Retina model that tops out at Ventura.

A standard 27" Retina model that tops out at Ventura.

A 27" iMac Pro model that can can be upgraded to Sonoma.


Please verify exactly which 2017 iMac model you have.

see > Identify your iMac model - Apple Support

Can't download or install macOS Sonoma - iMac Pro

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