Hi,
Thanks for the interest in our plugins. I can help out here.
Pro only includes the Pro plugin and no other add on.
Pro includes all the features on this page:
https://theeventscalendar.com/product/wordpress-events-calendar-pro/
Facebook Events, Community Events, etc are all separate add ons.
And after the year all the plugins will continue to work, but as you said there is no support or updates available.
As for the Facebook Plugin here are my answers:
How many pages I can add to plugin to load up correctly?
It depends on the amount of events per page. You can easily do 20 to 30, but as you get higher up it depends on your server and timeout settings.
The Events can be loaded just from public pages or also my profile (events which I attend), personal events etc
Public Pages can have their events imported automatically. For all profiles including your own you can only manually import events using the id.
Let me know if you have any follow up questions.
Thanks