The mod has now been split into 2 versions, one using the original demonyms (Aksumites, Hawaiians, Japanese, etc.) and a new one using toponyms (Mississippi, Normandy, France). I attempted to make this switch possible using the mod options menu, but database changes (as opposed to UI) using this framework do not appear to be possible at this time.
Choose one version, if both are installed demonyms will overwrite toponyms, and the Aksumite unique descriptions will look funky, but it will otherwise work fine.