The video below shows how to update the Youtube app on your tv box without getting an incompatibility message.
You will need to be signed into the Play Store on your tv box to get the latest Youtube app. If you haven’t already done that, do it now. The Play Store can be found in Apps which is on the main opening screen of your tv box. The Play Store icon looks like this,
Once you are signed into the Play Store, you can watch this instructional video,