I bought full Version before, now I need to buy it again :(
If you purchased on iOS, there should be a "Restore IAP" button on the main menu (or maybe it was the Options screen). Does pressing that help?
If not, it could be a mismatch between the account you purchased it on and the one you're logged-in with.
Let me know if either of the above help!
Dan Fedor - Founder, Blue Bottle Games