via press release:
Beginning today, Downton Abbey Season 4 is available for subscription streaming exclusively on Prime Instant Video.
Downton Abbey is the most watched TV series of all time on Prime Instant Video, with millions of Prime Instant Video customers having watched the show. With the addition of Season 4 today, Prime Instant Video is now the only video subscription service that offers all four seasons of Downton Abbey, and will continue to be the exclusive subscription home through Season 5.
A pre-World War I British period drama, Downton Abbey is one of the most widely watched and critically acclaimed television dramas in the world. The international series has won multiple Golden Globe, Primetime Emmy and Screen Actors Guild Awards.
Prime members have instant access to stream Downton Abbey on Fire TV, Kindle Fire, Kindle Fire HD, iPad, iPhone, iPod touch, Roku, Xbox, PlayStation 3, Wii and Wii U, among other connected TVs and devices—all at no additional cost to their membership.