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Activation Assistant Does not recognize serial number

Kevin Smith

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I have a new computer and have been struggling with installing Nitro Pro on it.

I first downloaded Nitro Pro 12 and tried to upgrade it, but that didn't work so I installed Pro 13, which I own, but the Activation assistant does not recognize my serial number, that I got from an earlier email. When I click activate with the serial number from a previous email, the Nitro Pro Activation Assistant says, "The serial number entered doesn't exist. Click 'Back' and make sure that you have entered the serial number correctly. If you still have problems, please contact support via the link below:

I have uninstalled the previous version.

So. following the links provided, I have arrived at this forum.


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  • Official Nitronaut
Allain Umailin

Hello @Kevin Smith,

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

Please be informed that 'The serial number entered does not exist' means the serial number you are trying to activate is for a different version of Nitro Pro. Looks like we need to uninstall the current version of Nitro Pro on your computer and install Nitro Pro 13. We then activate it using your serial number. Kindly follow these steps:
1. Uninstall Nitro Pro from your computer by going to Control Panel > Programs > Programs and Features then reboot the machine.

2. Please clear all your downloads folder or delete all downloaded Nitro installers. This step is important because we noticed that if you are saving all the installers and you download them in the same folder (like the downloads folder), the EXE can pick up any MSI installer in that folder and you may pick-up one of the older builds instead of the newly downloaded package.

3. Download your Nitro Pro 13 using these offline link/s:

x32 http://install.nitropdf.com/professional_13263505/en/retail/nitro_pro13_ba_x86.msi 
x64 http://install.nitropdf.com/professional_13263505/en/retail/nitro_pro13_ba_x64.msi

To know if you have 32-bit or 64-bit, please refer to this article: https://support.microsoft.com/en-ph/help/15056/windows-32-64-bit-faq

4. After installation, you can activate by opening Nitro Pro, clicking on the Help tab > About Nitro Pro > Activation and entering your serial number 50490x-xxxxxx-xxx161.

Thank you for choosing Nitro and I hope this helps.

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I messaged AllainU with my email, name and address regarding my purchase so that I can get my serial number (50490x-xxxxxx-xxx161) for Nitro Pro 13.

I don't know if there is anything more that I need to do and I don't know how he will reply.

Thanks for any help.

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