Trying to install Grasshopper plug-in into Rhino 6

I’m trying to use the existing Grasshopper plug-in for my Rhino 6 , but I keep getting an error message. How do I update to the latest Rhino service release, as it says in the pop-up window?

its pre installed. The green icon on the tool bar of the image you posted, second from the right.



Thank you!