The official ESET Mirror Tool acts as an automated pipeline. It allows an internet-connected workstation to clone the official update repositories, down-pack them into a physical folder structure, and convert that payload into a portable source.
Then just replace D:\ with your USB drive letter. eset nod32 antivirus offline updates new
For very old systems, some users still use zipped update archives. The Process : Download the offline_update_eav.zip The official ESET Mirror Tool acts as an automated pipeline