New Apple TV Download

Today I got the new Apple TV with Siri remote. I was told by the store manager there's two versions a 32gb and 64gb and both I could download movies from my iTunes purchases to watch offline.

great ideal for when I go aboard to hotels where a portal loging is required to access the wifi which the apple TV don't give a pop up option to sign into such networks.

SO because I can download movies to shows I've purchased previously and be able to watch them offline I made a purchase for the 64gb

now I'm about to throw the thing out the window so if you would like to save this Apple TV from destruction please tell me if I was mis informed or how to use this feature

thank you