Buy PDFpenPro now from our web store.
To buy from within the product itself:
1. Select Purchase / Register... from the PDFpen (or PDFpenPro) menu.
2. Follow the windows to purchase.
3. Your name and serial number will automatically register the product. You will also receive an email with your serial number. If you ever need to enter it manually, select Purchase / Register again, enter your name and serial number from the email and click the "Register" button.