You can unregister a plug-in package that you previously registered with a vCenter Server instance.
You can unregister the extension in the following ways:
Unregistering a plug-in package on vCenter Server does not delete the plug-in package files that are installed locally on the vSphere Web Client server. The files are not used after you unregister the package. To remove the files for cleanup purposes, you must delete the plug-in package files manually.