Updating ZoneAlarm Antivirus definitions and program components Updated May 02, 2021 20:51 Applies to: All Legacy v15.x ZoneAlarm Antivirus and Firewall products ZoneAlarm 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 updates Open ZoneAlarm software. Click on Update in the upper right corner.