YRTV Sent email to contact@esotericsoftware.com about a day ago. Will also post here in case email wasn't delivered. All this threads seem to be in this section. I started using VPN service Nord VPN recently. Can VPN be reason for ban? Only forum thread I found is http://ru.esotericsoftware.com/forum/I-have-to-re-enter-my-activation-code-each-time-IP-change-4301?p=20797&hilit=activation+code#p20797 Proxy is allowed I think, not sure about system wide http://ru.esotericsoftware.com/spine-proxy-server. P.S. My English may be terribly broke, and email is one-line.
YRTV For future readers. My activation code was never disabled by license system. VPN usage does not get you banned. Check your VPN for any extra filters. In my case Nord VPN new CyberSec option interfere with both editor and license page.