Michael Cox Posted April 5, 2021 Report Share Posted April 5, 2021 I am having an issue activating Nitro Pro 12. I uninstalled/reinstalled, still receiving the following error: -20: Error Invalid License Number When I check my serial number online it says the following: Number of activations: 0 Number of activations allowed: 2 Please advise how to correct this and get Nitro Pro activated. Link to comment Share on other sites More sharing options...
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