Hi,
Thanks for the interest in our plugins I can help out here.
Do I have to buy separate licenses for each extension?
Yes each plugin is separate. We are working on bundle pricing, but I do not have a timeline for it.
If I ad custom fields to the events structure, Are these fields also available in the front end to fill in by visitors that ad events?
Yes, if you add the additional fields through Pro they show in the front end form.
After the year has ended, can I still use the plug-ins? Or do I have to extend the subscription?
Yes, the plugins will still work after the year, but you will no longer have access to support or updates.
Let me know if you have any follow up questions.
Thanks