These files are destined to be used for generating LOD for Skyrim Original Edition but you can use them to generate the LOD for Skyrim Special Edition. Important: If you use these files to generate the LOD for Skyrim Special Edition, you must make them with the Creation Kit that goes with Skyrim Original Edition. Making them with the Creation Kit that comes with Skyrim Special Edition won't work. The related tutorial is here: How to generate Level of Detail (LOD) for a custom