Mac App Store Stops Working on Older macOS Versions
Mac users running macOS Mojave (10.14) and earlier versions are reporting widespread issues accessing the Mac App Store, with ...
Macworld4mon
Latest macOS versions: A complete list of every macOS and Mac OS X release
Since the arrival of Sequoia, Apple no longer supports macOS 12 Monterey which arrived in 2021 (and with the arrival of Sonoma in 2023 it stopped support for macOS Big Sur, which arrived in 2020).