Re: Sims 4 won't launch although running 64 bit system

@amysheepherd  If your computer runs Windows, then yes, you're correct.  (For Macs, the relevant question is whether the Mac supports Metal or not.)  But if you've been playing the 32-bit version of Sims 4, then Origin would have prompted you to download the Legacy Edition when it was released.

To launch in 64-bit, just change the option in Origin.  Open your game library, right-click on the Sims 4 icon, select Game Properties > Advanced Launch Options, and select 64-bit from the dropdown menu.  If you don't see it, right-click on the Sims 4 icon and select Repair, then look again.