Okie Architect Posted August 31, 2019 Report Share Posted August 31, 2019 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. Link to comment Share on other sites More sharing options...
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