The user activation email has a template field "{{activation_url}}" which is replaced with "https://support.easyindexplugin.com/register/....." We don't have a SSL for "support.easyindexplugin.com" so our clients see a scary, nasty "unsafe website" message.
Telling me to pay you $180 for an SSL certifcate when it would be trivially easy for you to allow the use of a FREE letsencrypt certificate is just unconscionably greedy.