Stronghold 3 is no longer available on the Mac App Store or Steam.

Stronghold 3 is a 32-bit app and macOS 10.14 was the last version to support running 32-bit games on macOS.  On 15 February 2024 Steam stopped supporting macOS 10.13 (High Sierra) and 10.14 (Mojave), effectively killing off support for 32-bit Mac games on Steam.  As a result we have made the decision to  remove Stronghold 3 from both the Mac App Store and Steam.