Re: How to change sims 4 to 64 bit on ea app?
@arieltiffany02 There's no way to switch between 32-bit and 64-bit within the EA App. What you can do instead is uninstall and reinstall Sims 4. All your purchases will be available to download as well, for free, in your game library. Your saves and other user data are in Documents > Electronic Arts > The Sims 4, and while this folder shouldn't be deleted during the uninstall process, it's still best to make a backup first just to be on the safe side.
However, I'm curious as to the error you're getting and why the game isn't already running in 64-bit. Try repairing the game: open your game library, hover over the Sims 4 icon, click the three dots, and select Repair. If that doesn't help, please post a screenshot of the error, and also let me know what antivirus you use, if any.