Updating ZoneAlarm Antivirus definitions and program components Applies to: All Legacy v15.x ZoneAlarm Antivirus and Firewall productsZoneAlarm will automatically check for Antivirus and/or component updates once an hour while your PC is running.* Free Antivirus and Firewall will check automatically once every 24 hours. To manually check for Antivirus and component updatesOpen ZoneAlarm software.Click on Update in the upper right corner.