I am trying to get my friend’s eM Client working again. In copying programs to a new computer, he somehow ended up with a trial version, which has since expired. I tried to register him for the free version, but he was already registered at the website. I had the website re-mail him his activation key, but it the received email said his registration expired February 2018 (originally registered 2015). I doubt that will help.
You could register a new Free License using a different email address.