Valid Serial # but still Error #20

[MillerD 0]

I have version 9 working on my Desktop.  I bought a laptop and want to use NitroPro on it.  I have downloaded and used NitroPro on that laptop and the free period is about to end.  When I type in the serial number for my active version 9, I get the response: -20 Error: Invalid license number.

However, The Nitro website for licenses  https://licenses.gonitro.com/prd/portal  does recognize my license.  That website asked me to deactivate and then re-activate the program, which I have done.  I still can not get NitroPro to recognize my license on my new laptop.  Please help.  

[Leslie V. 0]

Hello MillerD,

Your serial number is only good for version 9.

To upgrade to version 13, please proceed to the following web page,

https://www.gonitro.com/pro/upgrade

Enter your serial number and follow the prompts to receive a new Nitro Pro 13  serial key and installation files.

Let me know how you go.