Well, that’s a question we hear once in a while. As you may have noticed, there is no separate Pro version of the app in Google Play. Your observation is correct. The reason for that is because the upgrade is done using Google Play In-App Billing mechanism.
Okey, so how does the process go in practice? Let me show you how to upgrade the app with some illustration. You can click the images to view them larger.
The steps are very easy. Let’s go thru them:
Launch the app. Once started, tap Extras from the bottom menu. Then scroll down and select Upgrade.
Tap the ‘Upgrade now‘ button.
Check all the details and then tap ‘BUY‘ to make the purchase.
As with all Google Play purchases, this purchase is also bind to your Google Account. You can install the app to all your Android devices with a single purchase. Just download the free app from Google Play, launch it and the app should automatically upgrade to the Pro version. It is that simple.