@malwaretech if the update included a servicing stack update then that cannot be rolled back. A cumulative windows desktop update (CU) will include the latest cumulative update (lcu) and often a servicing stack update (ssu). You can roll back the LCU by targeting the CU number but if that cu had a ssu included then the ssu part of it will not be uninstalled ( the LCU will still be uninstalled)