Hello,
Thank you for contacting us
If you purchased the Cost Calculator PRO plugin, then DO NOT create support topics in these forums. You are eligible to get premium support through our Ticket System on our support website.
No author is allowed to support commercial products in ww.wp.xz.cn forums.
https://ww.wp.xz.cn/support/guidelines/#do-not-post-about-commercial-products
To contact us, simply use the Create a Ticket button in the Cost Calculator > Contact Us from the WordPress dashboard menu (when the PRO plugin is active). Or you can use this direct link.
If you have difficulties with activating your license, we have a step-by-step guide on How to activate plugin support.
Thank you,
Regards,
Jacob, Support Team