I'm not interested in another mod, I just want this one to work.
Understood. But BTMod is sort of left in the dust, and you will not find many using it anymore. BTMod was the first ever mod I added, but I have long since upgraded to Darnified UI and can therefore no longer help you with it - and I think that is the case for most players.
Also, what's the benefit of using OBMM instead of just adding mods on the 'data files' screen?
Many, but the two most important are:
* OBMM remembers all files that were added by an omod, so if you uninstall it, it uninstalls all the files.
* Many mods come with an omod installation scripts that ensures that all the right files get copied/renamed correctly, and have dialog's explaining the options and letting you choose them. For Darnified UI this means that you can just click on a number of buttons to get the install options you want.