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New computer

Jaime Backal

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Old computer is dying so I bought a new one and I can't activate my Nitro PDF Pro 6 on the new one.

I tries deactivating my copy in the old one and I get an error message:

ReturnLicense error2        :-77 ErrorExecution Error - Socket

When I try to activate the license in the new computer I get the error:


Unknown error.

Please help, the old computer is dying and I need to be able to use the new one before this happens

Thank you in advance


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  • Official Nitronaut

Hello @Jaime Backal

Thanks for reaching out to us! 

Please note that we no longer support Nitro Pro 6 and its activation servers have been shut down.

We recommend to upgrade to our latest version, V13, which comes with significant stability and security improvements, as well as many feature enhancements, in particular in conversion and OCR functions. To upgrade to Nitro Pro 13, please visit our upgrade page: 
Alternatively, you can upgrade to the latest build of Nitro Pro 12. Per our Sunset Policy, https://www.gonitro.com/nps/product-details/sunset-policy, we have stopped making feature enhancements to version 12 once we released version 13. You can find Nitro Pro 12 installer from the page below and activate it with your current Nitro Pro 6 serial number. 

Please let us know if you need any further assistance.

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Thank you Leslie,

At this point, business is too slow due to the pandemic so I am going to use version 12 and keep in mind updating once things get better.

Thank you very much for your help!

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