Good evening Nikolas and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
is there any way we can shop the pro version for one page and then use it to set up the web page in one hidden site and then also use it in the public site when the example page is done?
If I understand what you are trying to do, you want to be able to setup your test website first without having to pay for a separate license just for that. Can you confirm ?
If that’s the case, the good news is that you can do just that. I recommend reading the following article on that topic: https://theeventscalendar.com/knowledgebase/using-one-license-for-your-live-and-dev-sites/
Let me know if that helps.
Have a great day!
Geoff B.