Nikitas Polias Posted September 28, 2022 Report Share Posted September 28, 2022 I am having the same problem, i pasted my serial number to upgrade from Nitro Pro 12 to 13 and i also got the same massage. I looked for the 'Buy an upgrade license' but i cant find it anywhere. Now, what do i have to do to upgrade? Link to comment Share on other sites More sharing options...
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