They have gone out of business and many people are left with confusion on how they will be able to get they’re hands on it again. Hopefully Corel will add it as a plug-in to they’re program someday.
But in the meantime here are a few suggestions.
If you have PS you can immulate it by going into Filter, Noise, and using the Median at about 3-4 and then sharpened. I think it was suggested to make a sketch layer too and then you can add it using one of the blend modes or masking back in the median layer.
Jim Clatfelter has made this free action that simulates the Buzz Simplifier. It looks really good. Thank you Jim! http://8bf.net/