I have both Rhino 6 and 7 and I am unable to install Vray. Both Check Boxes are greyed ,I dont know what is the issue !
Sounds like a question for @Nikolay
Hi, which service packs of Rhino 6 and 7 you have installed ?
I have 6.0 and 7.0
You probably should update to Rhino 6.34 and 7.7