Addon enabled in Blender 2.82.7, Option to Import and Export .NIF Files not appearing under File · Issue #324 · niftools/blender_niftools_addon · GitHub
Niftools for Blender 2.49b - Python Support - Blender Artists Community
Releases · niftools/blender_niftools_addon
GitHub - korri123/fnv-blender-niftools-addon: Blender Niftools Addon adapted for Fallout New Vegas
Warped Mesh) Error On .nif Import Using Nifttools Addon v0.0.3 in Blender 2.83 and Blender 2.91 · Issue #413 · niftools/blender_niftools_addon · GitHub
NIF File Format Library and Tools download | SourceForge.net