Sid Meier-s Civilization- Beyond Earth - Rising Tide !link! Download Requirements Info

You cannot play Rising Tide as a standalone title. You must have Sid Meier’s Civilization: Beyond Earth installed on your Steam or Epic Games account first.

Rising Tide is fully supported on macOS and Linux (via Steam Play / Proton, with a native Linux build also available). However, the requirements differ slightly. You cannot play Rising Tide as a standalone title