William McManus Posted September 29, 2022 Report Share Posted September 29, 2022 My Nitro 13 Upgrade has been working fine since I upgraded in March 2021, but yesterday began to crash whenever I opened a PDF. Today I noticed that it was somehow not activated, but when I attempted to activate I received the message, "Invalid Serial Number." I have another copy of Nitro Pro 13 that is working just fine on another computer. Link to comment Share on other sites More sharing options...
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