The movie is a standalone feature (90 min). It is not part of the TV series numbering. If you see references to "Episode 36" in download contexts, that is an incorrect or pirated file label.
Naruto: Shippuden Blood Prison , is available for official download and streaming in English through several major platforms. Released in 2011, this film follows Naruto as he is falsely imprisoned in Hozuki Castle. Official Digital Download Options The movie is a standalone feature (90 min)
Naruto Shippuden the Movie: Blood Prison (2011) is widely regarded by reviewers as a "mixed bag" that deviates from the standard The movie is a standalone feature (90 min)