Full-Version Purchase
If you decide to buy the full version, open Screen Configuration (button with gear wheel or from menu) and select IAP-Purchase tab.
Screen will fetch IAP info from the AppStore server and once done, it shows:
Transaction status: "Ready"
Click "Buy the full version" and Transaction status will change to "Request sent..."
After a few seconds (typicaly up to 10 secs), Apple dialog appears asking for your password:
Once you enter it, it will take a few extra seconds and you will be asked to confirm the purchase:
Afer yet anoter couple of seconds, you will get the final confirmation:
and Purchasing status will change to "Purchased":