You can use the url-category db force-update command to download the latest URL categories from the third-party categorization database for the first time. You can also use the url-category db force-update command if you do not want to wait for 12 hours to download latest URL categories from the third-party categorization database.
To force immediate URL category updates:
Go to CLI configuration mode.
hostname > enable hostname # configure terminal
Specify an immediate update of all URL categories.
hostname (config) # url-category db force-update
Verify the status of the database configuration for the URL categories.
hostname (config) # show url-category db status DB Version : 3843 URL engine version : 4016 Update Status : No update in progress Auto update state : Auto Update Enabled Update Start time : Mon Jun 4 20:01:25 2018