Corrupted System Files - Unable to Load the Operating System. A sudden power outage or system. Finding corrupted files. Corrupted or damaged files can cause some of the following problems in Mac® OS X: Applications to crash or quit unexpectedly when opening a corrupted file. Indexing failures when using: Spotlight® under Mac OS X 10.4 Tiger® or later. Content Indexing and Find By Content under Mac OS X 10.3 Panther® and earlier.
Creating a bootable macOS installer on USB provides a convenient way to install a new copy of macOS on multiple Macs, while also allowing you to perform a 'clean' installation quickly and easily.
Creating a bootable macOS installer on USB provides a convenient way to install a new copy of macOS on multiple Macs, while also allowing you to perform a 'clean' installation quickly and easily.
If you've recently tried to run your installer and suddenly get a message saying it is corrupt and unusable, don't worry! Keep reading the following simple way to fix the problem.
Sometimes when using the macOS installer, you may get an error message that says something like:
( This copy of the Install macOS Mojave.app application is corrupt and cannot be used to install Mac operating systems .)
As Apple explained in a newly published support document, the likely cause of this 'broken installer' error message is that the certificate expires. Fortunately, the repair is very simple.
To fix a corrupted installer, simply reload the installer. Doing so will also ensure that you have all macOS updates that have been released since you created the original installer, meaning you won't have to update macOS as soon as the initial installation is completed.
You can find the latest official download links below for the 4 most recent versions of Apple's Mac operating system, all with new unexpired certificates:
To learn how to perform a clean macOS installation using a bootable USB method, please refer to the following articles: