On the offline computer, close the ESET GUI (right-click system tray icon → Disable / Pause protection temporarily).

You may need to boot into Safe Mode and modify a registry key (e.g., changing PackageFeatures value) to enable the "Update Mirror" or "Update Server" option in the Advanced Setup menu.

: Even when using patched files, the software often still requires a valid (or bypassed) license to initiate the manual update process. Risks and Considerations Security Risks

If the offline EAVZIP is newer, you will see "Virus signature database updated successfully."

By default, ESET expects to find the EAVZIP file in a very specific server-like structure (e.g., http://mirror/update/v1/ ). Dropping a single eav_nt64.zip on your desktop won’t work.