Re: Sims Medieval won't install Mac
@fsalldsapweo For Sims Medieval, does your computer run Catalina? If so, that's the issue: Medieval is a 32-bit app, and Catalina is 64-bit only. There's no way around this, other than to play in a different OS: by playing on a different computer, by installing Windows on your Mac (via Bootcamp or Parallels), or by installing Mojave or earlier on your Mac or an external drive. (Let me know if you want information about any of these options.)
For Sims 4, please check your iCloud settings. If your Documents folder is being synced with cloud storage, your Sims 4 user data is being moved too; when the game can't find that folder, it creates a new one with no content.
https://bluebellflora.com/2017/02/06/sims-3-and-sims-4-not-loading-save-games/