Ladies and gentlemen the game no longer launches

How do you find the toggle? I've looked everywhere and can't find it. Been having issues with Sims 4 and the EA app (which won't even install again, it keeps saying it is installed but it isn't). Literally looking for any tips since we're about to be snowed in for a while xp

Where is this magical button?!

i toggled the force start option in the properties on steam then i restarted my deck (for the 50th time today!) and I'm happy to report I AM IN!!!!!! 

I watched a YT video on how to download the EA app to the steam deck, and I did it, then when I opened my account within the actual EA app it showed saved data saying my last play time was July of 2025..... I was so irritated. I'm currently gen 6 in my current save (through steam) and I already had to start over due to accidentally deleting all protons and losing every save previously....

not sure if i should keep waiting for them to either address it or do a patch or something. 

I managed to find a way to get sims4 to run on steam deck flawlessly HOWEVER any DLC purchased though steam will not be on the game even if the EA launcher shows "x amount of DLC" 

If this would work for someone without any/many steam purchased DLC i'll be happy to share instructions. 

For me, I am still waiting for a response to my tickets with both EA and steam 

1. Switch to Desktop Mode (Steam button -> Power -> Switch to Deskop)

2. Download the EA App with Firefox

3. Launch the Discover Store and search for protontricks and install

4. Launch protontricks and select the game from the list

5. Choose “Select the default wineprefix”

6. On the next scren choose "Run Uninstaller"

7. Click EA App and then choose "Modify/Remove" to unistall it

8. Now choose "Install" and browse to the EA App you downloaded (most likely in Downloads)

9. The EA app window will pop up and choose repair

10. Once the repair is done it will show the login window. I just closed this and went back into Gaming Mode and my game launched fine.

Same. This issue started for me yesterday. 

same with me i finally wanted to play sims 4 again just for it to not work T^T

i play on a steam deck and have used both desktop and gaming mode to play/try to get sims4 to work. i've already seconded the above thread via replying to that one. i assumed this comment was having my same issue due to how recently it was posted

yes I agree