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I have updated Rhino 7 WIP. I am still getting an error message when trying to launch rhino from Bricsys.
This is fixed in the new release of the Grasshopper connector.
Just go to www.bricsys.com/applications/a/?rhino/grasshopper-connection-for-bricscad-bim-a1353-al2360 run the installer to Remove the program (please don't use repair) and then run the installer again to install the latest connector.
After that, retry the Rhino command, normally it should work if you have the latest BricsCAD (V20.1.08) and latest Rhino WIP (7.0.20021.12255, 21/01/2020 or later).
Thank you for following up, that works now!