Printer Pro Lite is a free application, that allows you to test your printer compatibility with the full version of Printer Pro. Printer Pro Lite contains 4 test documents. If all of them print properly, you can install the full version of the application.
Note: If the printing result is not acceptable - your printer model is not supported with Printer Pro.
Taking into account that the Printer Pro Lite app does not allow printing personal documents, the free application is not shown in the Open in... pop-up menu. If you want to print personal documents you need to use the full version of Printer Pro.