Ever since steam updated my Sims 4 installation yesterday I have been unable to load the game, and instead get the above error message. I have tried to follow all the things other people have done, including doing a clean windows install on my laptop, with nothing else on it at all, and just reinstalled steam and then Sims and the EA app, and still the same result. I tried raising a ticket in the EA app, but nobody ever responded to it 😠
I FIXED IT!!
I had this same issue happen today. My sims was working fine UNTIL I exited the app to download more custom content/mods, and went back to open sims and it said "failed to launch game".
I am unsure if this would work for you, but here is how I fixed it.
You have mods that won't let Sims 4 launch. Maybe the mod/mods are incompatible with the newest Sims 4 update, I'm not sure, but you have to go through and sort out your mods to see which one is making your game break. For me, it was easy because I just removed all the mods that I had recently downloaded today (since my game was working fine before I downloaded them). I put all of those mods in a separate folder on my desktop, and launched Sims, and it FINALLY opened.
After knowing that one or multiple of those new mods caused my game to not work, I went back to check one by one to see which were breaking my game. Then I moved the mods that did not break my game back into my mods folder.
If you use mods, please try this, as it may fix this issue!
