After completion, you’ll see: "Virus signature database has been updated successfully."

Insert the USB into the offline computer.

Go back to → Update → Setup.

Click .

Select (if listed – otherwise select the latest v5-compatible pack; v5 uses the v4/v5 update format ).

In that temporary ESET installation, go to Advanced Setup (F5) → Update → Mirror .

Extract the contents (right-click → Extract All). You should see folders like em001_32_... , em002_... , etc.

Copy the entire C:\ESET_APRIL_MIRROR folder to a USB drive.

Before starting, verify: