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Deactivate and Cannot Activate After Re-installation


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Hi, I tried to deactivate the Pro 12 license but it promoted for "choose device". but Both licenses are available as none of them are being used. Tried install Pro 12 but when key in Serial number, it prompted "-24: Activation Error".

Which part went wrong? Pls advise


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  • Official Nitronaut
Reymund Oyong

Greetings @jenliow

Thank you for reaching out through our Community Forums!

Please ensure that the version of the software matches the version of the serial number. To check which version and build is installed on the computer, open Nitro then navigate to the Help tab > About Nitro Pro.

If the version of the license is version 12, install Nitro PDF Pro  You can find the Nitro Pro installer from the link below:

https://www.gonitro.com/product-details/downloads - click the 'Download Nitro Pro 12' link 

After the installation, open Nitro then go to the Help tab > About Nitro Pro to confirm the version and build. If it shows, you should be able to activate it using your version 12 license that starts with 234.

Kind regards,

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