Yes, I use an older version of Blender for importing and exporting .nifs. My general workflow is, import .nif file into Blender 2.49, then export as .obj, 3ds or .dae format, import in a new version of Blender for production work. After I'm done with modelling I usually set the materials for the mesh before exporting it as an .obj (the reason I assign the materials in 2.7x is simply because I'm more used to that version) Lastly I import the .obj file in Blender 2.49, rig it, and export as .nif file Should be possible to do the rigging in 2.7x, if Blender 2.49 has some decent importers such as .FBX, not sure though. Might do a proper tutorial once I find time, as there are no up-to-date tutorials for Blender users. :)