Unable to find macos High Sierra download link in apple.com site
Inherited an iMacPro mid2011 with MacOS Yosemited, for which the apple website indicates that High Sierra is the highest macos version that can be installed. Unable to find it in the App Store, which directs you to Catalina and does not show an option to find High Sierra. From this link
https://www.macupdate.com/app/mac/61705/macos-high-sierra
which states:
"The best way to download Mac OS X High Sierra is via a direct link
download. This is primarily because Apple has hidden the installer from
the Mac App Store. This means that users that search for the installer
will not find anything if they have a newer version of Mac OS. Users can
download the app via a direct link and then install it that way."
Where can I find this "direct link"? Other websites that have a link to download High Sierra open a page "Connecting to the Mac App Store" and then a small pop-up "Select Application" in which iTunes is selected. Click on Open Link and get a message "Item Not Available - The item you've requested is not currently available in the U.S. store."
Thank you
iMac Pro