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Nitro Serial number invalid for Activation / Deactivation


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I purchased a license of Nitro Pro 12 approximately one year ago on my desktop. I recently went to install and activate the license on my laptop computer so that I could work while travelling and at home. When I went to activate my license I was prompted with "Invalid license number". 

I looked up my license number on the find my license tool and it showed up as having 2 activations, which was strange as it was only activated on my desktop. I clicked deactivate twice in the web browser and now it shows that there are 0 activations, however, it is still functioning on my desktop. Once again I have tried to activate on my laptop but again it says the license number is invalid.

Even stranger, when I navigate to the help tab inside of Nitro pro on my desktop, and click the "about nitro pro" button and try to deactivate, it again tells me my license is invalid, however Nitro Pro still functions in full on my desktop.


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  • Official Nitronaut
Allain Umailin

Hello @cbrook,

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

In order to further assist you, could you please provide a screenshot of your 'About Nitro Pro' window under Help tab?

Also, a screenshot of the error message you have received after entering your serial number.

To send them via private message, hover your mouse on top of my name 'AllainU' and select 'Message'.

To find out how to take a screen shot, check out this link: https://kb.gonitro.com/knowledgebase/#/search/screen/000004108 

Thank you very much in advance and I am looking forward to hearing back from you.  

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  • Official Nitronaut
Allain Umailin

Hello @cbrook,

Thank you for the private message.

Please be informed that 'Invalid Serial Number' means the serial number you are trying to activate is for a different installer of Nitro Pro 12. Looks like we need to uninstall the current version of Nitro Pro on your computer and install Nitro Pro 12 using our Online installer. We then activate it using your serial number. Kindly follow these steps:

1. Uninstall Nitro Pro from your computer 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 12 Online installers using these link/s:

x32 http://install.nitropdf.com/professional_12163574/en/retail/nitro_pro12_ba_x86.msi 
x64 http://install.nitropdf.com/professional_12163574/en/retail/nitro_pro12_ba_x64.msi

If you are unsure if your machine is using 32 or 64-bit, please refer to this link: https://kb.gonitro.com/knowledgebase/#/search/64/000003790 

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

Thank you for choosing Nitro and I hope this helps!

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