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sammysaenzzz Author

Level 1

4 points

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

Best reply

BDAqua

Level 10

239,435 points

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.

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How to fix the MacOS High Sierra application is damaged?

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