Looking for macOS High Sierra 10.13 installer

I recently bought a printer. While installing the driver I found I needed macOS 10.13 or higher. The printer box said 10.12 or higher. I am presently running Sierra 10.12.6 on an iMac 27 (Mid 2011). I tried downloading High Sierra 10.13 from the App Store. "Your search had no results" was the reply. I tried all the hits I could find on the web. All I found were High Sierra 10.13.2 or 10.13.4 or 10.13.6, all of which are updates that could only be mounted on 10.13. It seems it is no longer available.

I thought of leap frogging to 10.14 Mojave or 10.15 Catalina or 11.0 Big Sur, but my computer is to old.