Okay, so I just installed the g3d_support.py script into my .blender/scripts directory and followed all the directions, to get only this error message when I try to run it:

This is what the line in question (267) says:
for x in xrange(0,len(data.texturecoords),2): #Prepare the UV´s
In case you get the same error, simply remove the nonstandard character from the comment, so it looks like this:
for x in xrange(0,len(data.texturecoords),2): #Prepare the UVs
and it should work fine.