I am a dish network subscriber. I am always downloading a movie or a show and watching it later. I have even purchased an external device for saving. I now have ROKU. My question is if I se a move on like Apple TV or some other service, can I down load thru ROKU and save it my my Dish Networks DVR and then move it to my external device so I can watch it later?
No. The whole idea of streaming is that you can watch a program/movie whenever you want, so there's no reason to save it locally and most providers go out of their way to ensure that you can't download their content.