Cannot upgrade. Serial number not recognised.

[David Jeffery]

You keep sending emails about upgrades but my serial number is not recognised.

I am on Nitro 13.35.3.685

My serial number starts with 504932...

That agrees with the information in "About Nitro pro"

Please resolve this 

[Allain Umailin]

Hello @David Jeffery,

Thank you for reaching out to us through our Community Forums and our sincere apologies for this inconvenience.

Looking at your account records, you are already working with our latest version so please ignore the email upgrade offer.

As an aside, you may update to Nitro PDF Pro 13.58.0.1180 using the installer from this page:
https://www.gonitro.com/nps/product-details/downloads 

If you are getting the "Nitro Pro Wizard has failed" message using our .exe package, it is because it requires a stable Internet connection to download installation files so please use offline English MSI packages:

x32 https://downloads.gonitro.com/professional_13.58.0.1180/en/retail/nitro_pro13_ba_x86.msi
x64 https://downloads.gonitro.com/professional_13.58.0.1180/en/retail/nitro_pro13_ba_x64.msi 

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

Important: If you are using Chrome or any of the Chromium-based browsers (e.g., Vivaldi, etc.) and you are unable to access the above installer links, you're more than likely experiencing the results of a new security feature that was silently pushed out to the browsers, which blocks .exe/.msi/etc downloads without any visible error or prompt on the browser's frontend user space. In order to bypass this, please try these steps:

a. Right-click the link you're trying to download, and select "Save link as..."
b. Choose your save location and select "Save"
c. On the bottom edge of your browser window, the Downloads bar should now appear and the file will show up with a red error icon, attempting to block the download. Press the caret button and select "Keep"

Thank you for choosing Nitro and I hope this helps and again, our sincere apologies.