Samuel Bigambo Posted September 24, 2019 Report Share Posted September 24, 2019 Today I received my 2019 pre-purchased latest release of the Nitro Productivity Suite. I already have a downloaded trial version, the problem is it won't activate with the new serial number. I keep receiving "-20 error - Invalid license number. The serial number does not exist". My old Nitro Pro 11 serial number easily activates. I have tried deactivating my old Nitro Pro 11 but still the new serial number won't activate. Please help. Link to comment Share on other sites More sharing options...
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