Chapter 10 Install and System Administration for FortiOS 5.0 : FortiGuard : Antivirus and IPS : Manual updates
  
Manual updates
To manually update the signature definitions file, you need to first go to the Support web site at https://support.fortinet.com. Once logged in, select FortiGuard Service Updates from the Download area of the web page. The browser will present you the most current antivirus and IPS signature definitions which you can download.
Once downloaded to your computer, log into the FortiGate unit to load the definition file.
To load the definition file onto the FortiGate unit
1. Go to System > Config > FortiGuard.
2. Select the Update link for either AV Definitions or IPS Definitions.
3. Locate the downloaded file and select OK.
The upload may take a few minutes to complete.
See Also
Automatic updates
Antivirus and IPS Options
Support Contract and FortiGuard Subscription Services
FortiCloud
FortiGuard Services
Antivirus and IPS
Web filtering
Email filtering
Security tools
Troubleshooting