yes, there's a way but there's no easy way. you have to change the code to as3 and republish. there are no reliable shortcuts.
how do I change the code?
you have to understand as2 code so you can see what's being done and then you must understand as3 code so you can rewrite it. there are some automated conversions that can accomplish some of that but i haven't seen any that are less time-consuming that doing it the long way.