> Steam cuts the cord for legacy Windows and macOS
From the start of 2024, Valve officially dropped support for Windows 7, 8, and 8.1, as well as for macOS 10.13 High Sierra and 10.14 Mojave. The Register reported on the change at the end of 2023, as well as an informed guess as to why: because the underlying Chromium engine was dropping support for these elderly client OSes.
https://www.theregister.com/2024/11/20/valve_steam_legacy_os/