macOS Monterey version 12 is a stable, lightweight upgrade that works great on older Macs, and you can use the direct DMG or ISO links to download, install, upgrade, or downgrade your system easily.

Released in 2011 and 2012, Mac OS X Lion and OS X Mountain Lion were the last paid software updates for the Mac. Ten years ago, users needed to pay Apple $19.99 for the latest version of its OS X, and ...