unzip the file, drag it into the module folder then copy all the files from inside the Napoleonic wars folder into the great northern war folder.
DON'T REPLACE ANY OF THE FILES!
why not make a exe file? well im going to update it a lot, so its easier to do it like this rather than to edit an exe every time i need to post a simple fix.
if your having problems with the face mesh brf try to delete Napoleonic wars and TGNW, then uninstall mount and blade and re install it, then install the mod again.