Re: Unable to start: The Sims 4 is already running - Mac only
Are you running Catalina?
Do you have a Sims 4 folder in your Documents > Electronic Arts folder? If so please move the entire folder to your desktop and try to launch your game.
In System Preferences > Security & Privacy > Privacy > Files & Folders and check that Sims 4 has access to the Documents folder,
In System Preferences > Security & Privacy > Privacy > Full Disk Access make sure Origin has access
