Sensor error when processing Windows - Installed Software: The sensor's major version = 5 while its related probe's major version = 4Issue After upgrading, you may see this Error in the Discovery Log: Sensor error when processing Windows - Installed Software: The sensor's major version = 5 while its related probe's major version = 4ReleaseParis and laterCauseThis is almost certainly due to having the Revert_To_Legacy_WMI update set as a temporary workaround for PRB1348026 still in place. See: KB0860580 Removing customisations of Discovery Windows WMI probes, that had been applied for the changes in Madrid Patch 3/New York