ESET doesn't make definitions available from the web. Only licensed Business Editions of ESET products allow the user to create copies of update files which can be used to update other workstations located in the network. This installer was created using the current copy of update files located within a local folder ('mirror'). The update files are original and unmodified ones, obtained directly from ESET update servers. The installer only expands the update files into the folder specified by the user (default is C:\Update) and does not modify user's Windows registry by any means.

The installer can be used to update any version of ESET NOD32 / Smart Security v3.0, v4.0 on machines running Windows XP/2000/Vista/7 (32bit and 64bit).
When installation has completed, the update source - referred to by ESET as 'update server' - should be properly set within the ESET configuration panel prior to updating the software (please refer to ESET Help file). The product can then be updated offline from ESET tray icon (right-click --> Update).

The definitions can be used to update a product locally, or - more likely - ported to another computer that needs updating and is not connected to the internet.

Note: Username and/or password are not required on the target computer to update the product.