Unzip the GI_joe.zip and copy the mel and the scene file (GIJoe.lights) into your script directory.
Copy the GIJoe_icon.bmp into the 'icons' directory of the install directory of Maya (i.e.: drive:\AW\extras\icons)

with notepad edit the mel script and search the string 'your_script_directory_path/GIJoe.lights' (located in line 57)
Replace the existing path by your own script path (ex: d:/Maya/scripts/GIJoe.lights) . notice how its / not \. so D:\ would be incorrect , D:/ would be right. the slashes that is.

- Start a Maya session, and open the script editor by going to Window / General Editors / Script Editor. Once script editor is open , goto file / open script. open up the GI_Joe mel script , once its open goto script / execute. Once you have done that , use the command box at the bottom of the screen and type GI_Joe

its case sensitive so GI_Joe

dont take my word for it though, im sure there is a easier way , but whenever i type source GI_Joe it doesnt work. im sure someone here should know why