Reinstalling macOS High Sierra on an old iMac
Hi, I've got an old iMac (27-inch, Mid 2011) the latest macOS that supports it is High Sierra (10.13.6). The iMac accumulated a number of useless apps and utilities over the years, and I'd just like to wipe it, and do a clean install of High Sierra. I'm having trouble finding where to download the full install version though. I searched the App Store on the iMac for "High Sierra" and it didn't com up. I found this page on the Apple Support site "https://apps.apple.com/us/app/macos-high-sierra/id1246284741?mt=12". When I open it on my iMac, I get the App Store Preview page, but there is no link to take me to the App Store. (Interestingly enough, when I try this URL from my other, newer Mac (macOS 12.2), the preview page, does contain a link to the App Store High Sierra page, but when I click on it, it just takes me to the Software Update pane in Control Panel where it tells me that my Mac is up to date, instead of allowing me to download the software").
Any help with downloading the legit installer from Apple would be greatly appreciated.