High Sierra installer on imac.

Question

Level 1

8 points

High Sierra installer on imac.

I'm needing to upgrade from el capitan to high sierra on a mid 10 imac. I was following directions in a thread on this site but when I used the safari browser to get to the app store and hit 'open' to download the installer I get a message that says:

This copy of the Install macOS High Sierra.app application is damaged, and can’t be used to install macOS.

I'd appreciate any help in fixing this and getting me to an install so I can get back to work on my computer. I see other places claiming to have a copy to download but am nervous about using them.

Thanks

iMac 21.5″, OS X 10.11

Posted on Feb 16, 2021 1:34 PM

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Answer 1

Top-ranking reply

rbboom Author

Level 1

8 points

Feb 17, 2021 4:25 AM in response to dialabrain

That worked great! I’m all updated and back to work. Thank you so much for the prompt help!

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Answer 2

dialabrain

Level 10

124,349 points

Feb 16, 2021 2:32 PM in response to rbboom

Delete "Install macOS High Sierra" from the Applications folder. Try again while in Safe Mode.

How to use safe mode on your Mac - Apple Support

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Answer 3

Limnos

Level 10

417,757 points

Feb 16, 2021 1:43 PM in response to rbboom

Delete the current copy of the installer app in your Applications folder. Re-download it, preferably using a wired connection to the Internet, or at least wi-fi with a good strong signal.

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Answer 4

rbboom Author

Level 1

8 points

Feb 16, 2021 2:17 PM in response to Limnos

Ok I downloaded it over WiFi sitting right next to the router. Tried again, still have the problem. Turned off WiFi and tried with wire and no change

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Answer 5

rbboom Author

Level 1

8 points

Feb 16, 2021 2:53 PM in response to dialabrain

Ok. Now I realize that when I thought I had deleted it it came back. How do I get rid of it? Put in trash and emptied. When I reopen app folder it’s there again.

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