@Blue5Mermaid I can't speak to any of the original problem you're having. For the new problem, that is Apple's Gatekeeper needing some guidance from you. You can allow Origin to run by right-clicking (or control+click) on the Origin icon to get the contextual menu and selecting "Open." Once you do this you'll get the same prompt as before, but it will now also have an "Open" button. Once you click this Origin will no longer be quarantined by macOS and will launch as expected. You will likely also be prompted to allow Origin "Full Disk Access." This is necessary so that Origin can install games and files in various locations.
If this fixes your original problem as well, then once you install the Sims 4 updates and launch it you will likely ALSO be promtped to allow The Sims 4 to have access to your Documents directory. You should grant this permission so that The Sims 4 can create/read its saves/preferences folder in your Documents directory.
