: Go to Help and support > Change License and re-type your key. Clear Update Cache : Press F5 to open Advanced Setup. Go to Update > Profiles > Updates . Click Clear next to "Clear update cache." Restart your computer and try updating again.
: Ensure no "ghost" proxy is enabled in Advanced Setup > Connectivity > Proxy Server . : Go to Help and support > Change
Rare, but possible in restrictive countries. In that case, change update server to a mirror (e.g., http://update.eset.com instead of HTTPS) or use a VPN. : Go to Help and support > Change
In Advanced Setup (F5) , go to Update > HTTP Proxy and ensure it is set to "Global proxy server settings" or "Do not use proxy server" unless your network specifically requires one. : Go to Help and support > Change