Michael Wish Posted October 20, 2020 Report Share Posted October 20, 2020 I purchased Nitro Pro 12 in August 2019. Recently I started seeing the 401 error that a lot of people were getting. According to this forum, downloading Nitro Pro 13 is the way to solve that problem. However, my serial number will not allow me to activate Nitro Pro now and I also can't seem to find out how to download the 12 version. Please help! Link to comment Share on other sites More sharing options...
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