Elegant Description :
Dear expert user, the _GrasshopperUnloadPlugin command has been deactivated because reasons.
To be less facetious, it never really did what it claimed to do, and in the process of not-quite-doing-what-it-pretended-to-do caused more problems than it solved.
If you absolutely, positively need this feature in order to achieve and/or maintain a life worth living, please post something to this effect on https://discourse.mcneel.com
We apologise for the inconvenience.
What’s the solution ?