I have a serial number from my original purchase of Nitro Pro but I can't register the software on a new computer

[Daddy Coal]

When I try to register Nitro Pro on a new computer, the response to my entering my serial number is "that serial number doesn't exist".    I put my serial number into some Nitro Pro interface, and it says that the serial number exists, and that I have available 'activations'.  What should I do in order to register Nitro Pro on my new computer?

[Leslie V]

Hello @Daddy Coal

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.
 

[Daddy Coal]

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Edited June 9 by Leslie V
Deleted Confidential Information (Serial Number)

[Leslie V]

Hello @Daddy Coal

Thanks for sending your Nitro Pro 11 serial number.

Please note that we no longer support Nitro Pro 11 and its activation servers have been shut down.

We recommend to upgrade to our latest version, V14, which comes with significant stability and security improvements, as well as many feature enhancements, in particular in conversion and OCR functions. To upgrade to Nitro Pro 13, please visit our upgrade page: 
https://www.gonitro.com/pro/upgrade
 
Alternatively, you can upgrade to the latest build of Nitro Pro 12. Per our Sunset Policy, https://www.gonitro.com/nps/product-details/sunset-policy, we have stopped making feature enhancements to version 12 once we released version 13. You can find Nitro Pro 12 installer from the page below and activate it with your current Nitro Pro 11 serial number. 

x32 http://install.nitropdf.com/professional_12169574/en/retail/nitro_pro12_ba_x86.msi
x64 http://install.nitropdf.com/professional_12169574/en/retail/nitro_pro12_ba_x64.msi
 
Please let us know if you need any further assistance.