This mod is compatible with vanilla Morrowind too.

You can add .bsa files in Morrowind.ini in "Archive" section.
Example:

[Archives]
Archive 0=Morrowind.bsa
Archive 1=Tribunal.bsa
Archive 2=Bloodmoon.bsa
Archive 3=menorraheads.bsa

Or unpack .bsa with Bethesda Archive Extractor
https://www.nexusmods.com/fallout4/mods/78/?
If .bsa in unpacked you not need to add it to config and just copy the content to "Data Files"

Then, rename menorraheadsEN.omwaddon to menorraheadsEN.esp and enable it in Morrowind Launcher.exe or add in Morrowind.ini in the very bottom

GameFile0=Morrowind.esm
GameFile1=Bloodmoon.esm
GameFile2=Tribunal.esm
GameFile3=menorraheadsEN.esp

The only reason for using .omwaddon extension here is that mod this mod was not tested on vanilla but it should work