Sonia Sidhu Posted April 13, 2020 Report Share Posted April 13, 2020 I have Nitro Pro 9 on my old computer. I want to move the program to a new computer. I went to the old computer and found the activation number by going to the help menu and "about nitro pro." section. When I try to deactivate I receive an error message "20 Invalid License the serial number does not exist." I don't understand because this serial number is listed on the program. I paid for this program. Link to comment Share on other sites More sharing options...
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