Nitro Pro 12.0 Activation

[Technic 0]

Replacing Windows 7 PC with a Windows 10 PC.  Trying to "Deactivate" Nitro Pro so I can reinstall and "Activate" on new PC, but receiving "-20:Error - Invalid license number" message.  The license number entered is the one used to "Activate" the software.  Not sure why I'm receiving the error.  

Any assistance is appreciated.

[AllainU 0]

Hello @Technic,

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

Since I am unable to pull-up your account, could you please provide the serial number of your Nitro Pro 12?

To send it via private message, hover your mouse on top of my name 'AllainU' and select 'Message'.

Thank you very much in advance and I am looking forward to hearing back from you.