Since this is a third-party client, you won't find it on the official Google Play Store. You must "sideload" the APK:
: To sign in, navigate to the top-left corner, click Sign In , and use the web-based activation code provided on your screen at youtube.com . Smart Tv Youtube 6.17 391 Download Latest
: The APK file size is roughly 7.76 MB , ensuring it doesn't clog the limited storage common on older TV boxes. Since this is a third-party client, you won't
Smart YouTube TV 6.17.391 (noarch) (Android 4.0+) - APKMirror Since this is a third-party client