PG Calc Posted December 6, 2018 Report Share Posted December 6, 2018 Hi we have purchased several copies of Nitro Pro from you before and have never had this issue. I am trying to activate a copy that was purchased on 11/26/2018 and am receiving a -19: activation error. I go online to your activation troubleshooter and input my serial number and am told that it is an invalid serial number. Please advise. Link to comment Share on other sites More sharing options...
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