I can’t not install OS X on my Mac
I need to install Mac OS high sierra
MacBook Pro 15”, macOS 10.15
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In your profile you say you are on macOS 10.15, is this true, if that is true and you want to install macOS High Sierra (10.13.6)
then you are looking to downgrade your mac which is quite different and not exactly straight forward.
If you simply want to upgrade an older OS to High Sierra follow the instructions below.
Please use Safari to access the following link 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.
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'.