I have Revit 2018 installed in my machine. I believe RIR got Revit 2018.3 support with latest updates. When I start Rhino inside Revit, I get the following warnings:
Eventhough it gives these warnings, After I close them all and click “Start” button again, RIR works just fine? I believe this should be some sort of conflict, so maybe the team should look into it.