sandbox in free version?

Hi,

That feature isn’t available at the free version. You can test an online demo of the plugin (including sandbox option) at these pages:

Administration area: https://www.dreamweaverdownloads.com/demos/cp-contact-form-with-paypal/wp-login.php

Public area: https://www.dreamweaverdownloads.com/demos/cp-contact-form-with-paypal

Thank you!