Depending on your OS, download Kerio Connect 9.0.0 from Kerio Software Archive.Uninstall the current Kerio Connect version.Note: if you're running Kerio Connect 9.0.0 and up, steps 1-3 can be skipped.
If you have Kerio Connect 8.x, such as 8.5.0 or older, please use the following procedure: Sophos was replaced by the Bitdefender Antivirus engine. Sophos is considered as a legacy Antivirus provider, prior to the 9.2.1 version, that's why no updates are provided to the older versions of Kerio Connect and its virus databases. While clicking the 'Update now' button, the update failed error is returned. Cannot update internal Sophos antivirus now. Security logs are showing: Sophos virus database is out of date. (Translation from French) The current virus database was updated before: 792 days, 11 hours, 2 minutes While checking the Antivirus section, the virus database report shows the current database was updated a long time ago.