This copy of the Install macOS High Sierra.app application is damaged

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Level 1

31 points

This copy of the Install macOS High Sierra.app application is damaged

I have a mid2010 MBP that can only run High Sierra (10.13.x)

I am trying to install High Sierra via the App Store (as indicated via this page https://support.apple.com/en-us/HT208969) but I get this popup when I click the Open button.

"This copy of the Install macOS High Sierra.app application is damaged, and can‘t be used to install macOS."

since all the instructions seem to say that you need to download via the app store, I'm a bit stuck.

Posted on Nov 20, 2019 2:06 PM

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Answer 1

Dec 10, 2019 10:05 PM in response to Eric Tiffany

re: This copy of the Install macOS High Sierra.app application is damaged, and can‘t be used to install macOS. reply about

"using the recovery partition to reinstall from the net." Exactly where is the recovery partition, and how does that access the net?

Thanks! Stefan

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Answer 2

BDAqua

Level 10

245,579 points

Dec 10, 2019 10:13 PM in response to stefanfromsaintpaul

Also you can try deleting in Applications the Install MacOS something file& try again.

1. Start up from macOS Recovery

To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following combinations on your keyboard. Command-R is generally recommended, especially if you never installed macOS Sierra 10.12.4 or later.

Command (⌘)-R

Install the latest macOS that was installed on your Mac.

Option-⌘-R

Upgrade to the latest macOS compatible with your Mac.

Shift-Option-⌘-R

Install the macOS that came with your Mac, or the closest version still available.

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Answer 3

Eric Tiffany Author

Level 1

31 points

Nov 20, 2019 4:57 PM in response to BDAqua

Hi, I found a mention of that Date & Time hack elsewhere, but meanwhile I got on chat with Apple support who suggested using the recovery partition to reinstall from the net.

That worked great.

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