The offline installer is an essential tool for users who prefer to have a physical backup of their security software or need to install it on a device with limited connectivity.
Use an internet-connected computer running ESET to create a local update mirror on a shared network drive or USB stick. eset smart security premium offline installer link
For older versions or alternative product variants, you can also refer to the ESET Knowledgebase (KB2885) The offline installer is an essential tool for