As far as I recall, it is reasonably reliable on Blender 2.71 through 2.73— I think.

I use Blender 2.72 with the script.
On later versions I see mesh/ or animation corruption. Just download an earlier version from Blender.org. They have them all available. I have a dedicated separate install of Blender, just for LoG modeling. It has its own renamed shortcut to identify it.
The script can go in the scripts\addons_contrib folder. Once installed, (and enabled!), you get separate import and export options for LoG model and animation files.