Link to download High Sierra only showing Catalina
Hello,
I have a mid-2011 27' iMac currently running El Cap (10.11). I want to upgrade to High Sierra (10.13) as that's the last OS that will work on it. When I click on the link to download it from here https://support.apple.com/en-gb/HT208969
It takes me to my App store, but only offers macOS Catalina and I can't find High Sierra on there.
Is there another way to get it please?
Many thanks
Simon
iMac 27″, macOS 10.12