Sheldon Lerman Posted February 26, 2022 Report Share Posted February 26, 2022 I received e-mail to upgrade. When I entered my Nitro PDF Pro serial number, I received following 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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