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20:Error - Invalid license number


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I have recently purchased a license for nitro pro but I can't activate the license because the number I received is invalid.  I've followed the instructions to copy and paste to avoid mistakes, but it didn't work. Hope you can help me.

All the Best,


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  • Official Nitronaut

Hello Daniel,

Thanks for reaching out to us!

Please uninstall Nitro Pro and 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 serial number.

I hope that helps!

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