Make sure that you have the latest version of your ESET product. Upgrade to the latest version.
Verify that your internet connection is active by visiting the ESET home page. You must have an active internet connection before you can download updates.
Press the F5 key on your keyboard to access Advanced setup.
Click Update → Clear → OK.
Restart your computer.
Open the main program window of ESET Windows products and click Update → Check for updates. If the issue persists, uninstall and reinstall your ESET product.