Move the extracted folder to a portable device, such as a USB flash drive or an external hard drive. Plug the portable device into the offline computer.
Once the process is complete, you will see a message stating that the "Detection engine is up to date." Best Practices for Air-Gapped Security eset update offline
By default, ESET looks for updates on official company servers. You must redirect it to look at your USB drive instead. Open your ESET product main window. Press the F5 key on your keyboard to enter Advanced Setup. Navigate to the Update section in the left-hand menu. Move the extracted folder to a portable device,
Keeping your antivirus signatures current is the single most important task for maintaining system security. However, not every computer has a stable or safe connection to the internet. Whether you are managing a high-security "air-gapped" workstation, a remote server, or a PC with limited connectivity, you can still keep your ESET products updated using the offline update method. You must redirect it to look at your USB drive instead
By following these steps, you ensure that your isolated systems remain just as protected as those with full web access, closing the gap that hackers often exploit in disconnected environments.
ESET relies on frequent detection engine updates to identify the latest malware, ransomware, and phishing threats. When a machine is offline, it misses these critical patches. An offline update allows you to download the necessary files on a connected machine, transfer them via a USB drive or local network, and manually "feed" them to the isolated computer. Step 1: Download the Offline Update Files
How to Perform an ESET Offline Update: A Complete Step-by-Step Guide