You can get the free FlixHouse app for your Apple TV through the Apple App Store.
1- In the app store on Apple TV find Apps icon and click on it.
2- Go to top menu and click on search
3- Enter FlixHouse in the search box
4- FlixHouse app will pop app
5- Scroll down to it and click install. The FlixHouse app is free to install.
FlixHouse Apple TV app on the Apple App Store.