This project is abandoned and its default file will likely not work with the most recent version of World of Warcraft. Whether this project is out of date or its author has marked it as abandoned, this project is no longer maintained.
Some FuBar plugins require that there is actually an addon called "FuBar" in your system. This is it. All it does is load FuBar2Broker so that you can use a Broker (LDB) displayer of your choice.