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 It's probably an outdated mod but could be anything.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.
Hi, I’ve tried this and slowly put back my saves. It worked up until the last lot I added which is the latest game I’ve made. I really don’t want to lose this household and house I’ve just made. How can I fix it?
@KateBlackshaw Will that save load if you don't have mods/CC installed? Will an earlier version of it load? See
https://answers.ea.com/t5/Mod-CC-Issues/I-need-help-fixing-my-save/m-p/12640403#M42078
