The first thing you should do to try and remedy the “app damaged” error message is to re-download the app to the Mac, and make sure it comes from a trusted source.
What does it mean if a Mac installer says it is damaged and can’t be opened?
Below are the download links for the recent versions of macOS. Fortunately, there is a fairly simple solution to the “damaged” installer problem. The cause of this error is an expired certificate, and because the certificate is expired, the “Install macOS” app for Mojave, Sierra, and High Sierra will not run. app application is damaged, and can’t be used to install macOS.” is to re-download the installer again from Apple, which contains a new fresh certificate that is not expired. The easiest way to resolve the “This copy of the Install macOS. What do I do if my Mac Mojave is damaged? Go to the applications, and delete the "install macOS Mojave" file, and then you are able to re-download the file in app store. What to do when this copy of the install macOS Mojave application is damaged and can’t be used to install macOS?
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