i just got an email this morning, that said :
"so i guess depends on when you got your version of PT3.
- Players who purchased PokerTracker 3 before June 10, 2011 will receive a 70% discount on equivalent version upgrades to PokerTracker 4 prior to November 25, 2012.
- Users who purchased PokerTracker 3 after June 10, 2011 will receive an equivalent version upgrade to PokerTracker 4 for free!* "