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If you lot have attempted to utilise a MacOS installer application recently, you may notice an mistake bulletin stating something like "This copy of the Install macOS Mojave.app application is damaged, and tin can't be used to install macOS." This prevents the installer of macOS from working and running, and essentially makes the installer applications useless.

The cause of this error is an expired certificate, and because the document is expired the "Install macOS" app for Mojave, Sierra, and High Sierra will not run. Fortunately, there is a fairly simple solution to the "damaged" installer trouble.

Resolving "Install MacOS Application is Damaged, Can't be Used to Install MacOS" Error Messages with Mac OS System Installers

The easiest way to resolve the "This copy of the Install macOS .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 links below bespeak to Apple resource where you tin discover or download the updated macOS installers for Mojave, Loftier Sierra, and Sierra:

• Find macOS Mojave from Apple here – (straight App Store link)
• Find macOS Loftier Sierra from Apple tree here – (App Store link)
• Observe macOS Sierra from Apple here – (direct download link)

You may need to reboot the Mac after yous have downloaded the new (and valid certificate) installer application, particularly if you had already launched a version that showed the application damaged fault message.

If y'all exercise not download new versions of these macOS installer applications, you are likely to meet the error messages for each release if yous attempt to open or utilise the MacOS installer, or even a USB boot bulldoze created with ane of the expired installers:

"This re-create of the Install macOS Mojave.app application is damaged, and can't be used to install macOS."

"This re-create of the Install macOS Loftier Sierra.app application is damaged, and can't exist used to install macOS."

"This copy of the Install macOS Sierra.app awarding is damaged, and tin can't be used to install macOS."

If yous want to see specifics and the expired certificate itself, yous can investigate .pkg components of the MacOS Installer with tools like Suspicious Package and pkgutil, which tin can evidence the expired certificate that causes the mistake message:

Method 2: Modifying the Application Installer to Fix "Install MacOS Awarding is Damaged" Errors

This other approach to resolving the "Install MacOS Application is Damaged, Can't be Used to Install MacOS" error message was left by reader Howard in the comments, and some users have had success with this too:

You tin can likewise ready the This copy of the Install macOS Mojave.app application is damaged, and can't be used to install macOS. message like this:

Step i. Go to your Applications binder.

Step two. Find the Installer for macOS Mojave in Applications binder

Pace 3. Correct click on the installer and click "Show Package Contents".

Step 4. Click on binder named "Contents".

Footstep five. Click on the folder named "SharedSupport".

Step half dozen. Delete the file named "InstallInfo.plist".

Stride seven. Enter your administer countersign to confirm.

Step 8. Now open the installer for MacOS Mojave once again, information technology will run

If that fails, delete the installer and re-dowload it from Apple

Let us know if that approach worked for you in the comments, or if you simply re-downloaded the installer from the Mac App Store.

Like issues take happened with various Mac Bone installers in the by. Aside from re-downloading the installer, another pick that some users accept reported to work that gets around these sort of error messages for installers (and sometimes apps too) is setting the Macs clock back in fourth dimension (in this case, before Oct 2019 when the certificate expired rendering the installer application unusable), but that apparently doesn't work all the time with the Install MacOS Mojave app. Information technology'due south too not e'er a applied solution to adjust clocks particularly if yous plan on widely deploying, using, and archiving the installer apps for diverse MacOS releases and on unlike hardware. Instead, just re-download the new versions of "Install macOS.app" that you crave, and keep those around instead.

Many Mac users similar to maintain a repository of MacOS installer packages for older versions of system software. For example, I have a collection of MacOS installers including for Mac Bone X Snow Leopard, Mac OS 10 Mavericks, MacOS High Sierra, macOS Sierra, macOS Mojave, and MacOS Catalina. These tin can be used to build USB boot installers, restore systems, troubleshoot, perform clean installations of the various system software versions, perform upgrades to specific system software releases, and serve many other purposes. If you have a like installer archive, it'southward probably a good time to replace those installers with the new versions that won't be expired.

Take y'all run into the "application is damaged, and tin can't be used to install macOS" fault bulletin, and did you fix information technology by downloading a new macOS installer package? Did you detect another solution? Permit us know your experience with this issue in the comments beneath.

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Source: https://osxdaily.com/2019/10/24/fix-install-macos-application-damaged-cant-be-used-error-mac/

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