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Have you run into the вЂњapplication is damaged, and canвЂ™t be used to install macOSвЂќ error message, and did you fix it by downloading a new macOS installer package? Did you find another solution? Let us know your experience with this issue in the comments below.ДЄpple can certainly avoid this mess. If you have a similar installer archive, itвЂ™s probably a good time to replace those installers with the new versions that wonвЂ™t be expired.

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These 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.

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For example, I have a collection of MacOS installers including for Mac OS X Snow Leopard, Mac OS X Mavericks, MacOS High Sierra, macOS Sierra, macOS Mojave, and MacOS Catalina. Many Mac users like to maintain a repository of MacOS installer packages for older versions of system software. Instead, just re-download the new versions of вЂњInstall macOS.appвЂќ that you require, and keep those around instead. ItвЂ™s also not always a practical solution to adjust clocks particularly if you plan on widely deploying, using, and archiving the installer apps for various MacOS releases and on different hardware. Aside from re-downloading the installer, another option that some users have reported to work that gets around these sort of error messages for installers (and sometimes apps too) is setting the Macs clock back in time (in this case, before October 2019 when the certificate expired rendering the installer application unusable), but that apparently doesnвЂ™t work all the time with the Install MacOS Mojave app. Similar issues have happened with various Mac OS installers in the past. 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. If that fails, delete the installer and re-dowload it from Apple Now open the installer for MacOS Mojave again, it will run

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Enter your administer password to confirm. Click on the folder named вЂњSharedSupportвЂќ. Right click on the installer and click вЂњShow Package ContentsвЂќ. Find the Installer for macOS Mojave in Applications folder You can also fix the This copy of the Install macOS Mojave.app application is damaged, and canвЂ™t be used to install macOS. This other approach to resolving the вЂњInstall MacOS Application is Damaged, CanвЂ™t be Used to Install MacOSвЂќ error message was left by reader Howard in the comments, and some users have had success with this too: Method 2: Modifying the Application Installer to Fix вЂњInstall MacOS Application is DamagedвЂќ Errors pkg components of the MacOS Installer with tools like Suspicious Package and pkgutil, which can show the expired certificate that causes the error message: If you want to see specifics and the expired certificate itself, you can investigate. вЂњThis copy of the Install macOS Sierra.app application is damaged, and canвЂ™t be used to install macOS.вЂќ вЂњThis copy of the Install macOS High Sierra.app application is damaged, and canвЂ™t be used to install macOS.вЂќ вЂњThis copy of the Install macOS Mojave.app application is damaged, and canвЂ™t be used to install macOS.вЂќ

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If you do not download new versions of these macOS installer applications, you are likely to encounter the error messages for each release if you attempt to open or use the MacOS installer, or even a USB boot drive created with one of the expired installers: You may need to reboot the Mac after you have downloaded the new (and valid certificate) installer application, particularly if you had already launched a version that showed the application damaged error message. Find macOS Sierra from Apple here вЂ“ ( direct download link).Find macOS High Sierra from Apple here вЂ“ ( App Store link).Find macOS Mojave from Apple here вЂ“ ( 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: app application is damaged, and canвЂ™t be used to install macOS.вЂќ is to re-download the installer again from Apple, which contains a new fresh certificate that is not expired.

The easiest way to resolve the вЂњThis copy of the Install macOS.

Resolving вЂњInstall MacOS Application is Damaged, CanвЂ™t be Used to Install MacOSвЂќ Error Messages with Mac OS System Installers Fortunately, there is a fairly simple solution to the вЂњdamagedвЂќ installer problem. The cause of this error is an expired certificate, and because the certificate is expired the вЂњInstall macOSвЂќ app for Mojave, Sierra, and High Sierra will not run.

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