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Nitro Pro 12 Activation Issue

Helix Systems

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Helix Systems

Hi, Support

I am having an issue activating Nitro PDF Pro 12 on a Windows 10 workstation. I checked and re-checked the license on your website and current activation is 0. I tried using another available serial key and still getting the :23 Error License number already used. I was able to activate on a test workstation without any issues. I saw in the forum that this happens when the software was installed it did not generate a proper Computer ID which makes sense because when I was combing through the registry I did see an entry where there were all 0's. Please let me know if you are able to fix this on your end. Thank you

Douglas Ngai,


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  • Official Nitronaut

Hello @Helix Systems

Thanks for reaching out to us!

Please send me your serial number so I can check. I cannot locate it using the email address that you provided.

I look forward to your response.

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