Thank you for the info!
I just downloaded a copy of Nitro PDF Pro for individual from https://www.gonitro.com/features and its bundle id is : com.gonitro.NitroPDFPro.retail, which is also supported by Hook. The latest version is 13.3.
They also have business and sign versions. Could you please let us know which one you downloaded? And run the following command to get the its bundle id(change YourPDFProName to your app name).
osascript -e 'id of app "YourPDFProName"'
Also I guess PDFpenPro with bundle id: “com.smileonmymac.PDFpenPro” is not your default pdf viewer. Otherwise, you will see a dialog box when you click on the deep link. Could you please check?
Thank you