Fish.py is the original interpreter of Fish. The latest version can always be downloaded at [https://github.com/harpyon/fish.py/archives/master GitHub]. It requires that you have Python [http://www.python.org/download/releases/2.7.2/ 2.7], [http://www.python.org/download/releases/3.2.2/ 3.2] or [http://www.python.org/download/ newer] installed on your computer, because it´s the Python source code.