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Installing High Sierra on iMac 10.12.6

When I try to open High Sierra on the Application, it appears a banner saying the copy is damaged. You told me before that the problem isn't with the link, but that there's a damaged copy of the installer on your computer. How can I delete it?

iMac 21.5″, macOS 10.12

Posted on Jun 15, 2021 8:22 AM

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Question marked as Top-ranking reply

Posted on Jun 15, 2021 8:32 AM

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 High Sierra App in Applications, so expired Certificates are not expired.


Or... trash the Install MacsOS High Sierra.app in Applications, empty trash & restart, then a new copy of a more recent version can be downloaded…


Don't use FireFox for this link, it’ll offer strange erroneous errors…


https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12

3 replies
Question marked as Top-ranking reply

Jun 15, 2021 8:32 AM in response to dakybear

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 High Sierra App in Applications, so expired Certificates are not expired.


Or... trash the Install MacsOS High Sierra.app in Applications, empty trash & restart, then a new copy of a more recent version can be downloaded…


Don't use FireFox for this link, it’ll offer strange erroneous errors…


https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12

Installing High Sierra on iMac 10.12.6

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