The end.

As he was about to give up, John stumbled upon a website that offered a cracked version of PDFpenPro 13.1, complete with a license key. The website claimed that it was the latest version and that it would work perfectly.

From then on, John made sure to always use legitimate software and to keep track of his license keys. He learned a valuable lesson about the importance of respecting intellectual property and the benefits of supporting software developers.