This is the official method for servers and business environments. It requires you to run the on a connected machine. The tool downloads a complete copy of ESET’s update servers to a local folder (or network share). You then copy that folder to the offline machine.
Offline updates usually require a specific offline license file to be uploaded during the Mirror Tool configuration. eset offline update
ESET Offline Update lets you update ESET security products (signatures and engine files) without a direct Internet connection on the target machine by downloading update files on a separate machine and transferring them (USB, network share, etc.). This is the official method for servers and
The feature allows you to update virus signature databases and detection engine components on a computer that has no internet connection (or a very limited/unreliable one). You then copy that folder to the offline machine