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How to fix the MacOS High Sierra application is damaged?

This copy of the Install macOS High Sierra application is damaged, and can‘t be used to install macOS

iMac 21.5″, OS X 10.10

Posted on Sep 4, 2022 9:04 AM

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Question marked as Top-ranking reply

Posted on Sep 4, 2022 9:38 AM

If you’re short of bandwidth or data… Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS High Sierra App in Applications, so expired Certificates are not expired.


Otherwise Niel has the preferred method.

2 replies

How to fix the MacOS High Sierra application is damaged?

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