![]() ![]() Method 2: Modifying the application installer to fix “Install MacOS Application is Damaged” errors pkg components of the macOS installer with tools such as Suspicious Package and pkgutil, which can show the expired certificate causing the error: If you want to see the details and expired certificate yourself, you can examine. This copy of the Install macOS Sierra.app application is corrupted and cannot be used to install macOS. You may have to restart the Mac after downloading the new (and valid certificate) installation application, especially if you had already launched a version that showed the application corrupted error message. Find macOS Sierra from Apple here – (direct download link).Find macOS High Sierra from Apple here – (App Store link).Find macOS Mojave from Apple here – (direct App Store link).The links below point to Apple resources where you can find or download the updated macOS installers for Mojave, High Sierra, and Sierra: is to download the installer again from Apple, which contains a new fresh certificate that has not expired. app application is corrupt and cannot be used to install macOS”. The easiest way to fix the issue is “Install this copy of the MacOS. Fix “Install MacOS application is corrupt, cannot be used to install MacOS” error messages with Mac OS system installers Fortunately, there is a fairly simple solution to the “damaged” installation problem. The cause of this error is an expired certificate and because the certificate has expired, the “Install macOS” app for Mojave, Sierra and High Sierra cannot run. ![]()
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