Due to Morrowind's age, some mods from the Nexus are structured in a way that NMM can't use. In fact, most Morrowind mods are packaged with other, now outdated, mod managers in mind. If you read the forums at the Nexus, many people claim that NMM is terrible for Morrowind mods. This might have been true in 2002, but today NMM is the best tool by far, so I strongly recommend using it. The following mod-files have all been repacked so they work perfectly with NMM. Download manually and add to NMM via the "Add Mod from File" option (Unless otherwise specified).