Sorry, my mods were definitely not the greatest lol.
If he's not attacking, that's probably a bug. His playstyle is supposed to center around changing weapons for different methods of attacking.
Hold down space to swap weapons, and select them by releasing the spacebar while hovering over the desired weapon. Right click activates the weapon's special effect.
Please let me know more details if you continue to have problems with it. These mods are old and have a lot of issues.