This app is just the License key for AllCast. You must also download the free version of the app from here:
https://play.google.com/store/apps/details?id=com.koushikdutta.cast&hl=en

IF YOU ARE HAVING LICENSE ISSUES, MAKE SURE YOU HAVE THE LATEST VERSION OF FREE AND THE LATEST LICENSE INSTALLED!

AllCast Premium Features:

No advertisements
No splash screens
No limits on video lengths