Gerry Grant Posted April 27, 2018 Report Share Posted April 27, 2018 (edited) I un-installed Nitro Pro 11, but beforehand I wrote down the serial number. When I reinstalled the serial number would not work. Can anyone help, please? I get error -20 Edited April 27, 2018 by Gerry Grant error Link to comment Share on other sites More sharing options...
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