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Unable to upgrade from Nitro PDF 11 to 13


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Dear Sir/ Madam,

Can you please help me? I have a copy of Nitro PDF 11 with Software Assurance (Licence ********) purchased 1st December 2015.  I did not upgrade to Nitro PDF 12 but I am now trying to upgrade directly to Nitro PDF 13. I have downloaded v13 but when I try to activate it says that I have an invalid serial number. Also, when I tried to register for help, your support system did not send a validation eMail to my eMail address (*******), so I was forced to create another eMail address (********) which I am now using. Very strange. I look forward to hearing from you.

Robert Hope

Edited by Leslie V.
Confidential information edited
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  • Official Nitronaut

Hello Robert,

Thanks for reaching out to us!

I created a ticket so we can reach out to you directly regarding this upgrade.


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