All I wanted to do was to move my Sims 4 from a mechanical hard drive over to an SSD. I searched online, and it said it was easy to do. All I had to do was go into my origin settings and change my gam...
If all else fails, you could try saving your Saves and Tray folders separately (copy to documents folder or somewhere) so you don't lose any saves or sims you've saved to your library. Then uninstall the game and origin, reinstall both, then drop the Saves and Tray back into The Sims 4 folder. Annoyingly time consuming, but will probably work if your saves and tray files aren't corrupted. And apparently I type slow^.