First try version 1.1.1 and check if it works. If it doesn't there is or a plugin that has a conflict. Or you didn't uninstall the last on properly. Uninstall it and try installing it again.
Else you will need to give me the password of your admin account Database and FTP so I can check it
It also could be that you did install a previous version that send the mails if so it will not send any mails till it hits 90 days later

. It doesn't mean it will send mails every time you click the button.