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Why can't I find High Sierra in the App Store?

I'm trying to do a clean install on a bootable usb stick to my older (2012) mac pro. I wan't to download High Sierra but every link into the app store (even from Apple's page) shows a "Cannot Connect to App Store". Thoughts or ideas on where I can get that? i need to make a clean install for a new user.

Mac Pro

Posted on Aug 31, 2020 6:22 PM

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Question marked as Top-ranking reply

Posted on Aug 31, 2020 8:33 PM

High Sierra is available via the App Store.


Please use Safari to access the following links do not use Firefox


How to upgrade to macOS High Sierra - Apple Support


Before upgrading make a full back up of your Mac.


Check that third party apps you use have updates available for the new OS.

https://roaringapps.com

Check that your printers/ scanners etc have updated drivers and software available for the new OS.


Connect your mac to your router via cable rather than rely on WiFi.

Do not use your mac while it is downloading

and do not use any other devices that share the same internet connection.


If the App Store says ‘Open’ then it is detecting a previous download of the install app

go to the Applications folder locate Install macOS High Sierra.app.

Move it to the Trash, empty the Trash.

Restart, click on the link again, the App Store should say ‘Get' or 'Download'.

2 replies
Question marked as Top-ranking reply

Aug 31, 2020 8:33 PM in response to pkakos

High Sierra is available via the App Store.


Please use Safari to access the following links do not use Firefox


How to upgrade to macOS High Sierra - Apple Support


Before upgrading make a full back up of your Mac.


Check that third party apps you use have updates available for the new OS.

https://roaringapps.com

Check that your printers/ scanners etc have updated drivers and software available for the new OS.


Connect your mac to your router via cable rather than rely on WiFi.

Do not use your mac while it is downloading

and do not use any other devices that share the same internet connection.


If the App Store says ‘Open’ then it is detecting a previous download of the install app

go to the Applications folder locate Install macOS High Sierra.app.

Move it to the Trash, empty the Trash.

Restart, click on the link again, the App Store should say ‘Get' or 'Download'.

Aug 31, 2020 7:47 PM in response to pkakos

Don't use Firefox for this link...


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


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.

Why can't I find High Sierra in the App Store?

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