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 09:04 AM

Reply
Question marked as Top-ranking reply

Posted on Sep 4, 2022 09:38 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

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

How to fix the MacOS High Sierra application is damaged?

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.