Re: sims 4 can't run save files?
@ratnapping Try experimenting in a clean game folder, to remove any complicating factors. Move your existing Sims 4 folder out of Documents\Electronic Arts and onto your desktop; when you launch the game, a new folder will be spawned. Don't add anything to this folder yet. Start a new save—no need to spend much time on it, since this is just for testing—and try out CAS, live mode, and Build/Buy. Save, quit, launch the game again, and see whether you can get back into this save. Let me know either way.