Yea with watcher in place I quite did not get the motivation behind ErrorControl=critical. That flag is mostly used for driver services and is known to cause more pain than be of any use unless used for critical system services. Also, resetting the database permissions before you install will help, as there is a permission change between the two versions. This is the command: icacls c:/Programdata/osquery/osquery.db /reset /q /t