Redirect Users from Old Facebook App to other FB Application URL using FBML
Although FBML is dead already, you still need some code for the existing apps. if you need to redirect the users form the existing or demo Facebook apps to the released versions, you can easily put the following FBML code in the config file of your application. <fb:redirect url="http://apps.facebook.com/your-new-app" /> Hope that helps. Cheers!