I stumbled upon this plugin
Nowhere in its description in PackageManager does it say it is in fact a commercial release and requires a 3rd-party License purchase in order to be installed.
I do not know if it’s just overlooking on McNeel side that they didn’t expect people trying to exploit the easy distribution tool, or an mistake by the developer not enclosing this important fact or perhaps a deliberate act by the developer to boost their download count.
Whichever it is there is a problem.
I usually download plugins to test and see if I could find even one or two single components or commands that could fit my workflow. I bet many do that but this practice to install plugins filling my PC system folders and registry with garbage residue just to uninstall them (leaving some of the garbage residue inside) without even being able to test the software I find unacceptable and unethical.