Registered users of Amadeus Pro 1.x can purchase Amadeus Pro 2.x for $39.99 instead of the full price of $59.99 here. They will be issued with that special registration code that only works together with a valid registration code for Amadeus Pro 1.x.
As a general rule for future upgrades, minor upgrades will always be free of charge to existing users. I reserve myself the right to charge for major upgrades, but existing users of the latest version before a major upgrade will always get a substantial discount.