Installing Epic Games Launcher on Steam Deck might be a problem for some people. A good alternative is Heroic Games Launcher, which allows you to play all the games in your Epic Games library ...

Open Epic Games Launcher and go to your Library. If you’ve successfully downloaded the platform, open up the Epic Games Launcher to start playing Fall Guys.

Open Epic Games Launcher. Go to the Library. Click on the three vertical dots associated with the faulty game and then click on Verify. Wait for some time as the issue is resolved.