How to get Pro version?

I’m new to your plugin. Just got it, today. I like what I have seen, so far. I REALLY want more functionality, such as the ability to assignment to a vTiger user. The use of Captcha and others.

I would really like to know how to get the pro version.

Thanks.

https://www.ads-software.com/plugins/wp-leads-builder-any-crm/