The Force Immediate Update option lets you verify the URLs listed in the update.config file immediately. This option disregards the offset hour and interval set in the update.config file and updates the URLs listed.
Important 
1.
Navigate to Configure > Protocols > HTTP Scheduled Update > General.
2.
Ensure that Scheduled Update is enabled.
3.
Click the Update URLs tab.
4.
Enable Force Immediate Update.
5.
Click Apply.