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Getting -23: License number already used


Peder Simonsen

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Peder Simonsen

One of my clients gets this error message even after he deactivated his license on his old computer.

On the lice portal the serial number shows:

Number of Activations 0

Number of Activations Allowed  2

The version is 11 and so is the installer.

Can you please help?

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Allain Umailin

Hello @Simonix,

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

In order for me to further assist you with your concern, could you please send me a private message and provide the serial number of your Nitro Pro?

Thank you very much in advance and I am looking forward to hearing back from you.

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Allain Umailin

Hello @Simonix,

Thanks for your patience.

To send me a private message, hover your mouse on top of my name 'AllainU' and select 'Message'.

Thank you very much in advance and I am looking forward to hearing back from you. 

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Allain Umailin

Hello @Simonix,

Thank you for providing the serial number.

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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  • 4 months later...
Peder Simonsen

Hi AllainU

We had a correspondance in march where my client got a  -23 error allthough no licences were activated. You helped us fixing the license. Now he has the same issue once again on the very same computer. Suddenly he is switched to trial mode and again getting -23 error. Can you help once again - and maybe tell how to prevent these issues?

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Allain Umailin

Hello @Simonix,

Thank you for this information.

I was able to pull your previous private message and I just made an adjustment on the same Nitro Pro 11 serial number so please try activating again.

If the affected machine/s just installed a major Windows Updates, kindly note upon the upgrade of the operating system or installing a major Microsoft / Windows update, the Computer ID is changed, as it is comprised partially by the operating system. Once changed, this will no longer recognize the original installation causing the program to revert to trial mode.

As a workaround, we would need to make an adjustment on the license.

Should you have further questions, please do not hesitate to reach-out again.

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