This guide is about the How to Fix “application is damaged, can’t be used to install macOS” Errors. I will try my best so that you understand this guide very well. I hope you all like this guide How to Fix “application is damaged, can’t be used to install macOS” Errors.
If you’ve recently tried to use the MacOS installer, you may find an error message that says something “This copy of Install macOS from Mojave.app is corrupt and cannot be used to install macOS.” This prevents the macOS installer from working and running and makes the installers essentially useless.
The reason for this error is an expired certificate, and because the certificate has expired, Mojave, Sierra, and High Sierra “install macOS” will not work. Fortunately, there is a fairly simple solution to a “damaged” installer.
“Fix MacOS is corrupt, can’t be used to install MacOS” error messages with Mac OS Setup
The easiest way to resolve “This copy of macOS .app is corrupt and cannot be used to install macOS”. is to download the installer again from Apple, which contains a new new certificate that has not expired. The links below refer to Apple resources where you can find or download the updated macOS installers Mojave, High Sierra, and Sierra:
- Find macOS Mojave from Apple here – (direct link to App Store)
- Find macOS High Sierra from Apple here – (App Store link)
- Find macOS Sierra Apple here – (direct download link)
You may need to restart your Mac after downloading a new (and valid certificate) installer, especially if you’ve already started the version that showed a corrupted application error message.
If you don’t download new versions of these macOS installers, you may encounter error messages for each release if you try to open or use a MacOS installer or even a USB boot drive created with outdated installers:
“This copy of Install macOS from Mojave.app is corrupt and cannot be used to install macOS.”
“This copy of Install macOS High Sierra.app is corrupt and cannot be used to install macOS.”
“This copy of Install macOS Sierra.app is corrupt and cannot be used to install macOS.”
To see details and an expired certificate, you can examine the .pkg components of the MacOS Installer with tools such as a suspicious package and pkgutil that can display an expired certificate that causes an error message:
Method 2: Modify the Application Installer to fix “Install MacOS is damaged” errors
This second approach to resolving the “Install MacOS is corrupt, it can’t be used to install MacOS” error message was left in Howard’s comments, and some users have had success here as well:
You can also repair This copy of install macOS from Mojave.app is corrupted and cannot be used to install macOS. such message:
Step Navigate to the Applications folder.
Step Locate the MacOS Mojave installer in the Applications folder
Step Right-click the installer and click “Show Package Contents”.
Step Click the folder named Content.
Step Click the “SharedSupport” folder.
Step Delete the file named “InstallInfo.plist”.
Step Enter the administrator password to confirm.
Step Reopen the MacOS Mojave installer, it will work
If this fails, uninstall the installer and download it from Apple
Let us know if this approach works for you in the comments or if you simply re-downloaded the installer from the Mac App Store.
Similar problems have occurred in the past with several Mac OS installers. In addition to reloading the installer, another option that some users have reported working and that bypasses such error messages for installers (and sometimes applications) sets the Mac clock back in time (in this case, before January 2021, the certificate has expired, leaving the installer unusable), but does not appear to work all the time with Install MacOS Mojave. Adjusting clocks is also not always a practical solution, especially if you plan to install, use, and archive installers for multiple versions of MacOS and different hardware. Instead, just download the new versions of “Install macOS.app” you need and keep them around.
Many Mac users want to maintain an archive of MacOS installation packages for older versions of system software. For example, I have a collection of MacOS installers, including Mac OS X Snow Leopard, Mac OS X Mavericks, MacOS High Sierra, macOS Sierra, macOS Mojave, and MacOS Catalina. They can be used to build USB boot installers, restore systems, troubleshoot, perform clean installations of system software versions, upgrade to specific system software versions, and serve many other purposes. If you have a similar installer repository, it’s probably a good time to replace these installers with new versions that don’t expire.
Have you encountered the error message “The application is damaged and cannot be used to install macOS” and did you fix it by downloading a new macOS installation package? Did you find another solution? Tell us about your experience on this topic in the comments below.
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Apple Devices only.
mac OS or iOS
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