Questions about Crystal Reports

Hi,
I have again questions about Crystal Reports that I didn't have any answer :

With VB6, I can use Crystal Reports 4.5.
If I want to use an earlier version, I suppose I have to buy it. What does the recent versions permit to do that the 4.5 does not ?

I have seen that I can make the link with the database inside the .rpt file rather than with a data control in VB6. Which is the best solution ?

Actually, I can't use an ADO Data Control with the Crystal Report Control. It only accepts a classic Data Control. Is it normal ?

Thanks for all,
Jeremie