Like everyone else, we at have been learning by starting with the “first encounter” and then by adding to our knowledge and skills as we became more familiar with the effect… with its “system”. If you are not, you will find that many menu items and subroutines will be unavailable to you. Ray-MMD and Raycast are meant to run on a Windows 10 64-bit computer. 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!