In the KitKat era, Google had not yet unified its storefronts. On your phone, you had one app that handled Apps, Music, Books, and Movies. On Android TV 4.4.4, the Play Store was actually split in the user's mind.

Due to the lack of security updates, it is highly recommended to use an external streaming device (like a Chromecast with Google TV ) rather than the built-in Android 4.4.4 system to ensure app compatibility and security. If you'd like to try fixing it, I can: