A:AnswerGood morning,
Yes it does have YouTube TV already installed which I personally use myself. It also has many other streaming apps already installed as well.
A:AnswerYou go to Samsung USA and you either sign in or sign up. Aftrr that you go to My Account & there is a Register product. You register with the serial number & it will automatically show your tv.
A:AnswerNo but you can just download the app as I did and saved money for the 1st 6 months dealing directly with HBO MAX rather then through my cable provider.
A:AnswerThe the feet do not extend more than 24 inches. The feet can be removed but the TV is not secure without the feet. If you have 24 inches this will fit.