We just announced the availability of RhinoCAM 2018 for Rhino 6.0. The product installer can be downloaded from our web-site.
You can read about it here in this Press Release: https://mecsoft.com/mecsoft-releases-rhinocam-2018-for-rhino-6-0/
And here is a blog article about it. https://mecsoft.com/blog/rhinocam-2018-for-rhino-6-is-here/