Re: Getting Sims 4 to Launch without Steam
@Jirachiking You can try searching the EA App for Sims 4 and adding it to your game library. I'm not sure whether you'd be able to add it since you already own the Steam version.
If that doesn't work, you can temporarily unlink your Steam and EA accounts, add Sims 4 in the EA App, then re-link your accounts if you want.
In any event, you'll need to uninstall the Steam version of Sims 4 before installing the EA App version, or else your packs may not install properly.