The Sims 4 not Loading

PrincessFawn97  The update required message is a Known Issue with the EA App:

https://answers.ea.com/t5/Bug-Reports/EA-app-Error-quot-An-update-is-required-to-launch-this-game-quot/td-p/13817377

You can try uninstalling the App with Revo Uninstaller (the free version is fine), but that doesn't help much of the time.  Otherwise, just try playing with the App in offline mode.  But please leave this for now in case the real issue is elsewhere.

Instead, since the game won't open, please move the entire Sims 4 user folder out of Documents > Electronic Arts and onto your desktop.  When you launch the game, if it launches, a clean folder will spawn with no content.  (Your saves and other content will be intact in the folder you've moved but temporarily not read by the game.)  Don't add anything to the new folder yet; just see whether you can get far enough to start a new save and play in live mode for a bit.

Please only try to launch Sims 4 from within the EA App.  If the game throws the update required error again, try playing in offline mode.  If nothing happens at first (as now), instead of trying to launch Sims 4 from your desktop, stop there entirely and post a dxdiag.  Hit Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop.  From there, you can attach it to a reply using the camera (Insert Media) icon with the other formatting options.