The official stance of ExacqVision regarding security updates and auto-updates is they are off by default, because there is the potential risk of the NVR being rebooted during the update process which can stop video recording, so please plan accordingly!!!
ExacqVision cannot control the integrity of security patches or operating systems updates; therefore these off by default and leave it to the installation technician, IT staff or system owner to apply any updates or security patches to their ExacqVision Video Recorders.
Updating Windows Operating System Https://support.exacq.com/#/knowledge-base/article/5159
Updating Linux Operating System https://support.exacq.com/#/knowledge-base/article/5151