You can get the free FlixHouse app for your Android TV through the Play Store app.
Get apps & games
1- From the Android TV Home screen, scroll to “Apps.”
2- Select the Google Play Store app .
3- At the top of the screen, select Search .
4- Type and Search for FlixHouse.
5- Select the FlixHouse app.
6- Select Install. The FlixHouse app is free to install.
FlixHouse Android TV app on the Google Play Store