didn't recognize serial number. Says doesn't exist

[st. john Bannon 0]

I seem to have a similar issue. Version 13.31.0.605.  Moved to new computer. First it didn't recognize serial number.  Says doesn't exist. Then suggested to deactivate. System then recognized the # and deactivated. System indicates no more computers to deactivate. But still will not take serial #. 

[AllainU 0]

Hello @st. john Bannon,

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

Before continuing, please be aware that Nitro Pro 11 or older are already discontinued as documented in our Sunset Policy: https://www.gonitro.com/support/sunset-policy . With that, support for the discontinued versions are no longer available.  

If you are interested in upgrading your license to Nitro Pro 13 with a discounted rate, kindly access our Upgrade Portal and enter your Nitro Pro 10 serial number: https://www.gonitro.com/pro/upgrade 

You may also want to purchase Nitro VIP Access (formerly Software Assurance) that entitles users to free upgrades for the next release of Nitro Pro and Premium Support for one year after the purchase date. (Premium Support is prioritized ticket support with our Technical Support staff/Nitro Customer Success and Service Team for one year after the purchase date).

You should then receive an email confirmation with a new serial number to activate Nitro Pro 13 and to know more about some enhancements and fixes with Nitro Pro 13, please visit our Release Notes page https://www.gonitro.com/nps/product-details/release-notes 

In addition to that and many other feature improvements, version 13 also contains some important security vulnerabilities fixes that you might want to consider when deciding whether to upgrade to it or not. You can find out more about these fixes here:  https://www.gonitro.com/nps/security/updates 

However if you prefer working with an older version and as a courtesy, kindly uninstall the version you currently have by going to Control Panel \ Programs \ Programs and Features, reboot your machine and download Nitro Pro 10 installers from this page: 
https://kb.gonitro.com/knowledgebase#/search/online/000004464 

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

Thank you for choosing Nitro and I hope this helps.

[st. john Bannon 0]

Thanks so much. This very definitely helps.  All works. I'll probably upgrade (good deal), but have my V10 back and much appreciated. So thanks much.