Frances Williams Posted March 4, 2020 Report Share Posted March 4, 2020 Good day, I recently had a computer update and Nitro Pro 13 went back to trial version. I went to support and when asked to enter the serial number I did, but got the message that the serial number was not valid. I did not type a wrong number - I copy pasted. Please help. Thank you. Xiomara Link to comment Share on other sites More sharing options...
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