While the process of repairing the “This copy of the Install macOS Mojave.app application is damaged, and can’t be used to install macOS” isn’t fun, thankfully, it’s easy. Apple includes many full upgrade installer links on How to get old versions of macOS - Apple Support Go to Apple menu -> System Preferences -> Date and Time and select the closest time server to set your time, and do so. It’ll make your installation process a lot faster if you are recovering from a dead hard drive, since you won’t need to install macOS and then apply patches right afterward. First isolate why your Mac is slowing down or crashing before installing anything new. How to create a bootable macOS High Sierra USB driveĪnother benefit to making a new boot drive is that you’ll get all of the various macOS updates that have been released since you made your last one. How to create a macOS Mojave USB installer the easy way.If you are new to making macOS boot drives, we’ve got articles to help. 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. 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. 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.
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