![]() Fortunately, there is a fairly simple solution to the “damaged” installer problem.īelow are the download links for the recent versions of macOS. The cause of this error is an expired certificate, and because the certificate is expired, the “Install macOS” app for Mojave, Sierra, and High Sierra will not run. As first reported by, a fix is quite simple. If you’re getting the above error message when you go to install macOS, you’ll likely experience some panic about what to do. If you are getting an error similar to “This copy of the Install macOS Mojave.app application is damaged, and can’t be used to install macOS”, read on to learn how to fix it. ![]() If you have a drive created for Mojave, Sierra, and High Sierra, know that a certificate has expired. I am a big fan of using a tool like DiskMaker X to create them to keep around if I need to wipe a drive and reinstall macOS quickly. Click Restart, or wait for your Mac to reboot automatically.Longtime macOS users will know that even though the Mac has a built-in recovery partition, it’s always useful to have a dedicated USB drive with a macOS installer.Click Install, enter your administrator password, and click OK.Select the drive on which you want to install the public beta.Click Agree to accept the terms and conditions and then click Agree again to confirm.Click Continue at the bottom once you've finished backing up, or if you already performed a backup.Click Continue - assuming you've already backed up. A dropdown prompt will appear advising you to back up your Mac.Click continue at the bottom of the installer.If the macOS High Sierra installer doesn't automatically open upon restart, launch it from your Applications folder using the Finder. Install the macOS High Sierra Public Beta (If it doesn't show the public beta in the Updates list, manually restart your Mac and navigate back to the Updates section in the Mac App Store.) When the download is complete, your Mac should restart automatically. Click Update to download the public beta software. When the installer has completed the download, the Mac App Store should open automatically showing the Updates screen.Open the downloaded file in your Downloads window and double-click the package to run the installer.In the same Get Started section on the beta site's Mac tab, click the profile button under where it says Download macOS High Sierra public beta access utility, and wait for the file to download.Download the macOS High Sierra Public BetaĪfter enrolling in the Apple Beta Software Program, you need to grab the profile installer and run it on your Mac. On the Guide for Public Betas screen, with the Mac tab selected, scroll down to the Get Started section and tap on enroll your device. ![]() Agree to the Apple Beta Software Program terms and conditions if necessary. ![]()
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