I have the non-commercial free version of Renderman installed and it seems to be working in 3DCoat.
There is a minor problem though, when I try to render a character brought in from Character Creator 4. The whole character is rendered in the UV Room using 3DCoat Hardware as Render Engine under Tool Options. If I switch to Renderman as Render Engine in the drop-down menu, it also renders the whole character. However, if I click Render Preview, then a separate Renderman-window opens, but only 1 part of the character is rendered, for example the boots or a necktie. How do I select all the parts of the character so that the whole character is rendered in the Renderman-window?