The vulnerability or the patch database is a baseline against which
the available and missing patches in the machines are determined. The
database is periodically refreshed with latest Windows patches and placed
in the Central Patch Repository at the ManageEngine site. To schedule the Vulnerability update go to Desktop Management-> Admin-> Schedule Vulnerability Update and configure the scheduler settings.
[or]
Go to Desktop Management-> Patch, in the Scheduled Scan Summary table click on Configure Now link to schedule the patch scan. The Configure Now
link is displayed if you have not configured the vulnerability update
schedule earlier. If you have configured the vulnerability update schedule
already then Change link is displayed [instead of Configure Now]. Click on the Change link to change the vulnerability update schedule.