Uninstall license You may need to uninstall a license if you are making some hardware or software changes. Uninstall license with GRE licenserUse the Genero licensing graphical interface to uninstall your Genero Report Engine (GRE) product license.Uninstall license from command lineUse the greWrt -d command to uninstall your Genero Report Engine (GRE) product license.Related referenceSteps to GRE license installationLicensing upgrade product version