trying to update my MacBook air from sierra to Mojave. Get a message from the App Store saying that the installer is damaged.
MacBook Air 13″, macOS 10.12
If you get a corrupted message...
Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS Mohave App in Applications, so expired Certificates are not expired.
Or... trash the Install MacsOS Mojave.app in Applications then a new copy can be downloaded.
If you get a corrupted message...
Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS Mohave App in Applications, so expired Certificates are not expired.
Or... trash the Install MacsOS Mojave.app in Applications then a new copy can be downloaded.
Delete the Mojave installer from the Applications folder. The installer is named something like "Install macOS Mojave". After deleting the installer and emptying the Trash you can try downloading the installer again.
Here is an Apple article with links to various macOS installers:
https://support.apple.com/en-us/HT201372
Make sure to have a good backup before upgrading macOS just in case something goes wrong during the upgrade.
I had already gotten that advice from a friend. Didn’t work. Then I read on here that I should change the day/time to 2019. So I deleted the download, downloaded again and then changed day/time and tried installing. That worked!
thanks for all the advice here.
tried to update my MacBook air running Sierra to Mojave and got a message from the app store that the installer was damaged. So how do I upgrade to
