BetterRed your needs are more convoluted than my current ones. I mainly only record book info, including Quotations from the various epubs.
But - I've just re-read the blurb on what Free means:
'Citavi Free is a starter edition and is ideal for testing small solo and team projects up to 100 references.'
I think my first reading was one of wishful thinking - I thought that any 1 project could have up to 100 entries.
Whereas I think that Citavi means that irrespective of the number of projects one has they can only make 100 entries.
Yeah, I know it's only $130.22 for the personal use fee, but heh, this is just a hobby and that kind of outlay really makes it a more serious consideration.