Alright so I'm attempting to run the installer as my NMM won't let me use the Download (NMM) button and I'm attempting to set the directory to C:\Program Files (x86)\Steam\steamapps\common\Morrowind where the Morrowind.exe is located and for some reason it keeps saying it must be installed into the Morrowind directory. Edit: Found the solution. For some reason when I clicked on the directory the installer would make the location C:\Program Files (x86)\Steam\steamapps\common\Morrowind\New folder as if it was trying to create a new folder to install the mod into instead of where I had clicked on. Wierd. Just typed the address manually and it worked.