Hey, i just followed all the steps given, except for one. I wasn't sure what version of nifscripts to download, because once I opened the link given, I was redirected to a page where there was no downloadable file. So instead, I downloaded version 2.5.7.12a, as recommended by Coffee Junkie, and then followed all of your steps.
However, when I got to the part to open Nif_common.py, I turned on "Enables python text plugins", and tried to open the file. I got an error message along the lines of:
"Error: .../nif_common.py Failed. File is not a Blender file".
I thought that when I turned on "Enables python text plugins", it would allow me to do this.
Any ideas?
Thank you.