Valid serial number but unable to upgrade to Nitro 12

[Okie Architect 0]

I recently purchased a new windows based computer and retired my older model.  I was able to reactivate Nitro 11, but when I tried to upgrade to 12 before the deadline tonight, I received this message:   "We were unable to validate your serial number.  Please ensure you entered it correctly.  If you believe you are eligible for an upgrade, please leave a post on our Community Forum and update us with your issue.

[Reymund G. 0]

Hi @Okie Architect,

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

Please provide your Nitro Pro 11 serial number and the link you used to upgrade to Nitro Pro 12.
Kindly send these information through private message.

Cheers,