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Activate Nitro 12 Invalid Serial Error 23: License number already used


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I had some OS problems couldn't log in so I did reset 

now reinstalled Nitro Pro 12 again then I checked the serial online and it showed 

Number of Activations  0

Number of Activations Allowed   2

but when I use it on the software to activate I get error 23 msg that I reached the Max. activation

need help with that please 


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  • Official Nitronaut
Allain Umailin

Hello @dispatcher,

Thank you for reaching out to us through our Community Forums!

I just made an adjustment on your license, so you can now activate your copy of Nitro Pro by going to Help tab > About Nitro Pro > Activate, entering your serial number and clicking Activate.

Thank you for choosing Nitro and I hope this helps!

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