DM me your license key\email associated with your AdGuard account. Might be that your license either is an old type of license either you don't have a slot for a new device. In case of second option, head to adguard.com and login to your personal account, head to "My licenses" tab and unbind the non-used device. Then activate your key once again.What an effing waste of time. It says I have no license key, yet AdGuard is working fine on Windows and shows a key but it is munged.