Question about reselling sites with WPRobot installed

I've been contacting the company with no response so I'm hoping someone here can offer some ideas.
I finally decided to sell "starter" sites. I bought a copy of wprobot over a year ago, but don't know how to tell if I have a developer license or not. Can't find the receipt in my email. Is there a way to look it up? If I don't have a developer license, is there a legit way to sell the sites with the plugin installed and not have any issues from buyers in the future?

On their site you can see that you need "developer version", then you can include wp robot to sites that you will sell.

If you can install it on unlimited sites, then really it doesn't matter. How would they know you no longer own the website? The question you should be asking is selling sites with scraped content that can get buyer banned from buyer or legal action taken against them will be a problem. WP plugin reselling is less of an issue.

What is wprobot good for? I did a google search but I'm not understanding the flip side (pun intended) and useful BHW resources