Ray-MMD is complicated for the first-time user and like everything else in MikuMikuDance, it takes practice and some experience with it before you begin to obtain satisfactory results with Raycast. You cannot simply download the effect and apply the RAY.X to your animation.
The Raycast Effect, now known as RAY-MMD, is so much MORE than “an effect”… it’s a whole “visual environment” sub-system in itself!