And what do you think hm? I am not living in USA so in other words dont care... I only care about where I live.

... and if it's not gmail? Let's assume that the TO's description corresponds to the facts. Then perhaps you have not yet grasped the full implications.

ПК Windows Tritel - Симферополь - не подключается. Ростелеком - Москва - не подключается. Мобильные Android Волна (Крым) - обрыв подключения каждые несколько секунд. МТС - обрыв подключения каждые несколько секунд. Роутер Tritel - Симферополь - профиль Wireguard в Keenetic - работает. Ну, по крайней мере понятно, что от провайдера не зависит.

If it was gmail... Yeah why not...

also by email?

У меня установлен KIS, (на 5 компов) через 48 дней, заканчивается ключ. 1. По предложенной вами ссылке предлагается 3 вида продукта. Если я выберу Premium, то мой ключ подойдет? И так же будет на 5 устройств?

Vivaldi is not officially supported. You can maybe run this browser as protected but now i think it is not possible. Brave browser also in past worked but now i cant run it. Only these browsers are supported bellow on screenshot. Compatibility is not guarantined by kaspersky because newest versions might having some new features and cause it incompatibility with kaspersky for example.

I am getting the definite feeling it is a Vivaldi problem, however please explain what you mean by " Compatibility is not guarantined with newest versions... " - newest versions of what with what?