There is a download link on the pastebin page that allows direct saving of the python script.
(Alternatively, there is a toolbar button to copy the script to the clipboard, and that can be pasted and saved.)
AFAIK the path you list is correct. If I had to guess, it is that some bit of the file was missed, and is causing an error. I have used the script in Blender 2.71 to load models.
*But when it comes to exporting them (even unchanged!) Blender hangs indefinitely for me.

Is there some trick to it? (I mean some very specific selection that must be made before exporting?)