The ShapeDiver Grasshopper Plugin doesn not start up properly when Rhino Command “SetDotNetRuntime” is set to “NETCore”, which is however the default state for latest Rh releases and some other plugins do require this setting.
Rhino Version 8 SR25
(8.25.25302.9531, 2025-10-29)
I also tested using the latest service release candidate Rhino 8 SR 25, and it works as expected. Please review your folder `%APPDATA%`\McNeel\Rhinoceros\package` for unused versions of the ShapeDiver plugin and remove them if you find some.