Fornite mobile has updates from time to time. But if you’re seeing all day the message in the Fortnite mobile app that an update is required, but the update doesn’t appear in your app store all day, you don’t need to worry because there is an easy way to solve it:
Instructions on how to force the Fornite mobile update
If you’re seeing, just like I did, all the day the message in the Fortnite mobile app that an update is required but nothing happens in the app store or Google Play store, go to step 2.
Remove the Fornite app from your device just like you would delete any other app.
Search for Fornite in the iOs app store or the Google Play store and download the app again. You will now automatically have the latest version again.
Once the app has been re-installed, you’ll be invited to login again to your account. Once you’ve done that, you’ll be up and running again.