Is steam required to play it? On Mac OS X (Tahoe 26.2) I get the following error:

[S_API FAIL] SteamAPI_Init() failed; ipcserver init failed .

[S_API] SteamAPI_Init(): SteamAPI_IsSteamRunning() did not locate a running instance of Steam.

[S_API] SteamAPI_Init(): Could not determine Steam client install directory.

Fatal Error - Steam must be running to play this game (SteamAPI_Init() failed).