There seems to be a little bit of confusion as to how in-app purchases are unlocked in Minigore and when it can be done. Let me walk you through the process.
You can reunlock any premium characters you have already purchased for free and you can do it right away. That is to say iTunes won't charge you twice for downloading the same content. Use the "BUY NOW" button to unlock your premium character and when asked for your credentials, log in with the same iTunes account you used to make the original purchase. iTunes will then tell you have already bought this content and can download it for free.
Please note that for anyone who is running Episode 3.7, Minigore will not be able to create a save file and will have all the characters locked again the next time you start the time.
The fix is already implemented and we are now working on ways to make up for lost data. The update will be submitted in the next few days. Thanks for your patience and understanding, folks! Again, truly sorry about the data loss.