Hi,
Thanks for the interest in our plugins. I can answer your questions.
First, we do not provide support or contact by email or phone. We do 100% of that through our ticketing forums.
So I can help out here for your questions.
The core version of the Events Calendar is always found for free on WordPress.org: https://wordpress.org/plugins/the-events-calendar/
And we have nonprofit program you can apply for here, to get a free unsupported version of Pro:
https://theeventscalendar.com/knowledgebase/do-you-offer-discounts-for-non-profit-organizations/
Let me know if you have any follow up questions.
Thanks