Users with The Bat! v.4.0 licence, as well as The Bat! v.3 users that purchased the program after November, 20, 2007, can use their existing licence keys with no additional payments or updates.
Registered users of The Bat! are eligible for a 30% discount for The Bat! 4.1. Previously purchased keys are not cancelled and can be used at the same time in accordance with the terms of the licence agreement.