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Unable to Activate


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So my trial expired and I attempted to activate, but I received the "invalid serial number" message.  I emailed and requested verification of the billing information and received the same serial number as I already had.  Attempted to activate again, but received the same "invalid Serial Number" message again.  Please explain how to activate when I have this problem.


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  • Official Nitronaut


Thanks for reaching out to us! I am happy to assist you.

Please uninstall the old version of Nitro Pro and install Nitro Pro 13. You can get the correct version 13 installers from this page: 

After installation, you can activate by opening Nitro, click on the Help tab > About Nitro Pro > Activate and enter your new serial number

Please let me know how that goes.

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