I updated the game today and now it will not run. I don't know if it matters but I am using the trial version. I was planning to purchase the full game but now I am afraid to if it isn't working. My trial doesn't run out until 9/13 so that isn't the problem. It was working fine before the update.
I am having the same issue as well and I have the full deluxe version of the game. I even removed every single mod and repaired the game and I still keep getting "The Sims 4 has stopped working" the second it tries to load.
Try resetting your user files as described in the factory reset described in this post: http://answers.ea.com/t5/The-Sims-4/FAQ-Troubleshooting-Steps-amp-Known-Issues/m-p/3621199
You won't loose anything. Just make sure to not delete any files and make a backup.
Try on a new game with nothing added back first (start new game). If it works, put back your save game and try again. If it still works, you can start putting stuff back.
The rest does not need putting back, cause they are mostly cache files that recreate or log files that are not needed for the game.
I don't work or have any association with EA. I give advice to the best of my knowledge and cannot be held responsible for any damage done to your computer/game.
Please only contact me via PM when asked to do so.
September 2017 - last edited September 2017
@blayd1021 I'm not sure what the issue is, but mine wouldn't launch after the failed update until I quit origin (as pictured), updated & restarted comp, then repaired the sims 4 from the drop down menu on its origin page.