The Web Update Wizard 'keeps score' of software updates and Campaign Manager preferences in the file WebUpdateSvc4.ini.
Each software update URL handled by the Web Update Wizard has a separate section in the ini file, which records the last processed update in the "Counter=" entry. If you ever need to assist a user in re-running automatic updates from a certain section integer value, you can ask them to edit the appropriate section of their ini file, which is saved in the Windows folder.
See also: Keyword IniSectionID.