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Unable to (re)register NitroPDF 12 Pro


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My NitroPDF 12 just went from registered to trial. An attempt to re-register failed.

-23:Error - License number already used.


Even deactivating the license and try to re-registers fails. The license information shows: Number of Activations = 0

Luckily I'm not the only in this.


Thanks for the support,


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  • Official Nitronaut
Allain Umailin

Hello @maja,

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.

Thanks for choosing Nitro Pro and I hope this helps!

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