
Quick Summary
If you play Steam games on macOS 11 (Big Sur), you've got two months to upgrade your OS before the Steam Client stops working.
While this rules out some older Macs, it'll continue to work on any running macOS 12 and above.
While Apple is preparing to launch macOS 26, many Mac users prefer to stay with older versions of the operating system either because the latest versions don't support their kit. However, if you're a Steam gamer, that could be a problem in a couple of months from now.