Is there still a watermark in the created PDF? (If no, then the Pro version is active)
Can you select PDF layouts 2, 3 & 4 in one of the "invoice types"? (If yes, then the Pro version is active)
Can you enable the Cloud Sync? (If yes, then the Pro version is active)
Does a file picker UI show up when you click the "Add font" button under the "My company" tab? (If yes, then the Pro version is active)