The documentation mentions that "OSX install has become a challenge. With the Enthought transition to Canopy we cannot figure out clean install directions for 3rd party packages and therefore can no longer recommend using EPD for SpacePy." They have other directions including some using MacPorts.
Installation directions for Linux and Windows seem straight-forward.
This is a familiar story for this type of software. It has consistently been my experience that installation on OSX is likely to be a headache, whereas on linux it's effortless. Never tried Windows.
Installation directions for Linux and Windows seem straight-forward.