hi Thomas,
They’re sold as paid apps. If you wish to implement in-app purchasing, you’ll have to edit the code yourself.
Darren
Update on this thread: I have now updated all but 1 of the apps to the Graphics 2.0 engine, so these should all work with the latest version of Corona.
The only one that was not updated was “Goal” (I have no plans to update that, so if you download Goal please keep in mind that you’ll need to build using a version of Corona that supports Graphics 1.0).
Hi Darren 
i send you a pm , can you verify that please
Marc