Download, and drop the .esm into your /morrowind/data files/ folder. If you're using a mod list organizer or MMO, I think you may need to edit the file to have .esm be .ESM for the program to see it- Idk why that's the case with the modlist organizer I use, but hey, what can you do. This all should be simple enough, and if you're looking for this file, you probably understand enough to know how to use it. Cheers.