Here's a way you can migrate your paid users...

Release your new app as free with in-app purchase and create a way to use 
an unlock code. You'll need a server interface to check the validity of the 
code and a way of telling your existing customers about it. Using an unlock 
code will make it possible for paid users to download your new free app and 
use it without having to pay again.

-John Coryat

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