i downloaded the new poker tracker 3 and i didnt have to pay anything. im not sure if there's a trial or anything(didnt say anything about it), but i uploaded over 10 000 hands. it seems pretty amazing, can't believe i didnt have the other versions before.
The fee will be based on when you bought PT2. If you just bought PT2 a short time ago, like in th elast couple months, you will get the biggest discount from them. PT3 will also include a HUD.