Yogesh Jain Posted May 6 Report Share Posted May 6 I am trying to Upgrade by Nitro PDF Pro version, when I put my serial number on this page https://gonitro.com/support/upgrade it gives me this error 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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