Uninstall license You may need to uninstall a license if you are making some hardware or software changes. Uninstall license with GRE for Java licenserUse this procedure to uninstall a license for your Genero Report Writer product using the Genero Report Engine for Java Licenser.Uninstall license from command lineUse this procedure to uninstall a license for your Genero Report Writer product using grxWrt.