macOS Sequoia update shows “installer is damaged” on iMac running Big Sur 11.7.10

I am running MacOS Big Sur 11.7.10 and although I have automatic updates turned on, when I try to update to Sequoia I get a message saying the the Sequoia app is damaged and cannot be uploaded. Any ideas why it would be saying that?


[Re-Titled by Moderator]

Original Title: Unable to update to Sequoia

iMac 27″, macOS 11.7

Posted on Oct 10, 2025 10:40 PM

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Question marked as Top-ranking reply

Posted on Oct 11, 2025 1:23 AM

Make sure you don't have an old Sequoia installer in /Applications. Then download a new one and apply that. But updating via system Settings should also work (boot to safe mode if it doesn't).


How to download and install macOS - Apple Support


But do make a backup before upgrading.

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macOS Sequoia update shows “installer is damaged” on iMac running Big Sur 11.7.10

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