1. Download update file and unpack him in one of your drives(C).
2. Got to your ESET product(Antivirus or Smart security) and press "F5" button.
3. Select "Update" section from settings list.
4. Click to "Edit" button.
5. Enter update files directory path(ex:C:\ESET_Update) in "Update servers" field and click to "Add" button.
6. Now select your added path in "Update server list" box and click to "Ok" button.
7. CLike to "Ok" button of ESET settings window for applying changes and then update your ESET antivirus or smart security(Click to "Update Virus Signature database" in update section).
8. Enjoy!
Special note for ESET v5, v6 and v7 users:
Before anything(above steps) go to safe mode then go to below registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\ESET\ESET Security\CurrentVersion\Info
Change value of "PackageFeatures" to:
For version 5 set to 1
For version 6 smart security change "53" to "51"
For version 6 Antivirus change "22" to "20"
For version 7 smart security change "53" to "54"
For version 7 Antivirus change "22" to "24"
This registry key changes make visible "Edit" button in Update setting in v5, v6 and v7.