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Unable to activate my license after it stopped working

Robert Lusk

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Robert Lusk



My Nitro 12 version is no longer working on the same pc it's been working on for a few years.  

-I uninstalled, rebooted and reinstalled the latest 64bit version from your website

-I have verified that I have (0) used activations and (2) available

Every time I go to activate I get: "-24: Activation Error"

Any thoughts on how next to proceed?

License: 2346005xxxxxx53121

Current Version:





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  • Official Nitronaut
Allain Umailin

Hello @Robert Lusk,

Thank you for reaching out to us through our Community Forums!

We want to make you aware of the change to your product that may affect its activation performance.

To continue offering our customers the very best PDF tools, we have upgraded our servers and has shutdown the one your older version of Nitro Pro runs on so please install Nitro Pro by getting the installer from this page:


After installation, you can activate by opening Nitro Pro, clicking on the Help tab > About Nitro Pro > Activate by entering the same serial number.

Thank you for choosing Nitro and stay safe always!

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