I have a dell xps 13 with windows 10. I tried to install nitro pro 11 and I received an installation failed notification. nitro pro 12 trial installed fine. I have an active license for nitro pro 11 so I'd like to use it. I've tried all of the suggestions listed in this thread and none have helped.
If the PDFpenPro 13 is still installed on your machine, you can use our Nitro Migration Assistant.
You can use this to migrate library items (custom and stamps), customized User Preferences and licensing and registration data with this utility app.
You can download the utility and the instructions here: -to-nitro-migrator