You can download the video via the page linked above.
Every week, Barnes & Noble gives away digital copies of a book, an app (usually a game or kids' app) and a video (almost always the pilot episode of a TV series) for the 27 hours between midnight EST and midnight PST the next day.
Barnes & Noble stores are also holding a Teenage Mutant Ninja Turtles Day on Friday, in sync with both their Get Pop Cultured! month of events and the theatrical release of Jonathan Liebesman and Michael Bay's Teenage Mutant Ninja Turtles today. The film is expected to take the top spot at the domestic box office.
The kid-friendly series, which debuted in 2012, stars Sean Astin, Robert Paulsen, Jason Biggs and Greg Cipes as the Turtles.