Hold up, I thought it requires the entire MWE program thingy?
Morrowind Enhanced Dev Kit is the v1.6 of MWE. The difference between this version of MWE and the previous one is that it adds more new script functions and also that it adds a compiler if you want to make your own MWE mods, but of course, it also has the files needed if you just want to play MWE mods and not making new ones.
The mod requires that you install MWE in your Morrowind directory. You need two files if you just want to play MWE mods: "Morrowind Enhanced.exe" and "Morrowind Enhanced.dll". Then, you have to check "MWE_Base.esp" (required to have any other MWE mod working) and "Enhanced_Stealth.esp" (the mod itself). After installing MWE and Enhanced Stealth, you just have to start MWE by double-clicking on "Morrowind Enhanced.exe" and have it running in the background, then launch Morrowind normally.