Go to APK mirror via whatever browser (or sideload it however you want) and install the APK.

You get HUGE black bars on the side (looks like a phone forced into portrait) and need to use the A button and joystick to imitate swiping lol.

BUT if you turn on a show, then use the joystick/mouse to click on full screen, it plays the video full screen (maxed at 720p from what I have found). It is OBVIOUSLY not an AndroidTV APK, so this behavior is expected.

I personally am going to keep casting from my phone/tablet but just figured I'd throw it out there.