I have ticked following three options
1. Do NOT send administrator an email whenever a new user registers
2. Do NOT send administrator an email whenever a new user is created by an administrator
3. Send administrator an email after a new user is verified
and have verification email enabled, when user clicks on verification_url following error message is displayed in browser
Warning: Missing argument 3 for Register_Plus_Redux::send_admin_mail(), called in /home/absolu34/public_html/prview.org/test-imsignals/wp-content/plugins/register-plus-redux/rpr-login.php on line 441 and defined in /home/absolu34/public_html/prview.org/test-imsignals/wp-content/plugins/register-plus-redux/register-plus-redux.php on line 434
If option 3 is un-ticked then no warning
PS a link to the support site in the setup page will not be missed.