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Downloaded Nitro on New CPU - Activation Serial Number not Working

Alfredo Castaneda

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Alfredo Castaneda

Exact message:

The serial number entered does not exist.

Click 'Back' and make sure that you have entered the serial number correctly.

If you still encounter problems, please contact support. 


Activation Portal shows that my membership is still Valid. Please help.

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  • Official Nitronaut

Hello Alfredo,

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 version 13 serial number.

Please let me know how that goes.

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