This is the official method for modern ESET products to distribute updates to offline clients.
. The screen began to crawl with progress bars as the signature databases—freshly harvested from a secure satellite downlink a thousand miles away—mirrored onto his local server. eset nod32 offline update full
If the offline computer is very far behind on updates (e.g., months or years old), simply updating the virus definitions may not be enough. The software engine itself might be outdated. This is the official method for modern ESET