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I am trying to update my OS to High Sierra on my older iMac 5K

None of the links shown here on Apple ( https://support.apple.com/en-us/HT211683 ) for downloading High Sierra go anywhere. I am trying to upgrade the Sierra OS on this machine to High Sierra and not finding anyway to access the software. I cannot go to a later OS at this time as I need to migrate some data first. Any ideas?

iMac 27″ 5K, macOS 10.12

Posted on Dec 9, 2021 3:53 PM

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Question marked as Top-ranking reply

Posted on Dec 15, 2021 2:51 PM

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…

13 replies
Question marked as Top-ranking reply

Dec 15, 2021 2:51 PM in response to bprdesigns

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…

I am trying to update my OS to High Sierra on my older iMac 5K

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