![]() ![]() To fix the damaged installer, you should just download the installer again. If you tried to use a macOS installer in the last few days or weeks, you may have been met with an error message saying something like " This copy of the Install macOS Mojave.app application is damaged, and can’t be used to install macOS."Īs Apple explains in a newly published support document, the likely reason for the "damaged" error message is an expired certificate. ![]() If you tried to run your installer recently and unexpectedly received an error that it is damaged and can't be used, then don't worry – keep reading for a simple and straightforward way to fix it. Creating a macOS installer on a bootable USB drive provides a convenient way of installing a fresh copy of macOS on multiple Macs, and also allows you to perform a clean installation quickly and easily.
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