Damaged macOS Mojave installer
I downloaded the macOS Mojave installer on my 2015 MacBook Air. However, upon opening the installer, it gives this error message:
This copy of the Install macOS Mojave application is damaged, and can‘t be used to install macOS.
Please do guide me on how to re-download this installer or any other method to install macOS Mojave on my MacBook.
As per this discussion on Apple support community, you should be able to overcome the issue by deleting InstallInfo.plist file from within the macOS Mojave installer app.
Go to your applications folder.
Find the installer for macOS Mojave.
Right click on the installer and click "Show Package Contents".
Click on folder named "Contents".
Click on the folder named "SharedSupport".
Delete the file named "InstallInfo.plist".
Enter your administer password to confirm.
Now open the installer.
It’s much more likely the certificate that signs the package is expired or there is damage to the contents of the installer, making it fail a tampering check.
- Software update on obsolete system: is it real?
Once you validate your mac is connected to the internet and the time is within 3 minutes or so of correct (closer is better) you can check the package or just download it again if that’s easier for you in most cases.