Look for the next to the "Buy" or "Install" buttons on game store pages.
As of , Steam officially stopped supporting macOS 10.15 (Catalina) . download-steam-for-mac-get-into-pc
Not all games on Steam run natively on Mac. To find ones that do: Look for the next to the "Buy" or
Civ 5 on Mac OS - Workaround for the Steam Client Bug : r/civ5 download-steam-for-mac-get-into-pc