Have you tried opening the game with while offline?
Try renaming your The Sims 4 folder to something else. Then start the game. If the game does not start and crashes after renaming your folder when you try to start it new, then try a game repair.
If the game starts, it will create a new The Sims 4 folder. Then once you've gone through making and placing the sim, save and quit. Then copy your saves folder from the renamed game folder to the new one and test that. If it works, don't save, just quit. Then copy over your mods folder and test again. If it crashes at that point but didn't before adding the Mods folder, you've got something in your mods folder that you will have to remove or update. It's probably an outdated mod but could be anything. You'll just have to go through what you have to find the problem file.
Hope this helps.
What should I do when it doesn't open after I add the Save file from the renamed folder to the new The Sim 4 folder Save file?
@y2k_Angel8 That depends on what else you've moved back. Have you moved back any mods/CC yet? Or is this before moving those back? If you moved back mods/CC first, did you test them on a new save?
