Xnurbs plugin worked fine on Rhino 7 and on Rhino 8 (a trial period, 11 days left)
But when I installed Rhino 5, the plugin stopped working
I deleted Rhino 5.
I also deleted and reinstalled Rhino 7 and Rhino 8, but the plugin is not installed
Gives a message
Error loading - XNurbsRhino7.rhp
Unable to load XNurbsRhino7.rhp plug-in: application initialization failed