The German edition, Stromaufwärts: Das bewegte Leben eines Amazonasvolks (Konstanz University Press), can be purchased here.
A review appeared in the Frankfurter Allgemeine Zeitung on 18 December 2015. (PDF copy here: faz_review_reduced.) My German-speaking friends tell me that it’s favorable. It contains a factual error, however: Evaristo Nugkuag does not serve as a member of the Peruvian parliament; it’s Eduardo Nayap as stated in the book.