Difficulty downloading/installing High Sierra.

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Level 1

69 points

Difficulty downloading/installing High Sierra.

Hi,

I need to upgrade to High Sierra, but every time I try to download/install, it says: "This copy of the Install macOS High Sierra.app application is damaged, and can‘t be used to install macOS."

This is the page from which I am trying to download it from: https://support.apple.com/en-ca/HT208969

I know this subject has been posted before, but I don't find any solutions.

I am presently on Sierra on a MacBook Pro (Retina, 15-inch, Mid 2015).

Thank you!

Chris.

MacBook Pro 15″, macOS 10.12

Posted on Jul 28, 2020 4:57 PM

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Answer 1

Top-ranking reply

BDAqua

Level 10

245,165 points

Jul 28, 2020 5:43 PM in response to Krissserz

Hithere,

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 then a new copy more recent version can be downloaded.

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