If you are looking to understand the architecture , read the ESET NOD32 Antivirus Technology White Paper . If you are troubleshooting a specific issue related to the "803191" update , check the ESET Knowledgebase for release notes associated with that specific signature database version.

ESET NOD32 Antivirus and ESET Smart Security version represent a significant legacy milestone in the evolution of ESET's security software . Released primarily to ensure seamless transition and protection during the launch of Windows 10 (build 10240), this specific build focused on internal hardening and performance optimization. Key Technical Enhancements in Version 8.0.319.1