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Failed licence Re Activation

Dan Sillito

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Ive Deactivated my old licence, using  Deactivation Certificate, but on thee website keeps saying invalid certificate. Its a straight copy and paste!

Try to deactivate via the website, it brings a pop up box saying "select licence to deactivate", with no options to select anything.

Where do i go, support just goes in a circle -im stuck!!


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  • Official Nitronaut
Allain Umailin

Hello @Dan Sillito,

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

We want to make you aware of the change to your product that may affect its activation performance and to continue offering our customers the very best PDF tools, please install Nitro Pro using the below offline English MSI installers:

x32 http://install.nitropdf.com/professional_12169574/en/retail/nitro_pro12_ba_x86.msi
x64 http://install.nitropdf.com/professional_12169574/en/retail/nitro_pro12_ba_x64.msi

To know if you have 32-bit or 64-bit, please refer to this article:

After installation, you can activate it by opening Nitro Pro, clicking on the Help tab > About Nitro Pro > Activate by entering the same serial number 234600-xxxxxx-624183

Thank you for choosing Nitro and I hope this helps.

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@Allain Umailin

My old computer had version 

My new computer has version

Are you asking me to downgrade my new one? My computer wont let me Uninstall the new version. I get a pop up saying "Something is blocking Nitro from proceeding"



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Allain Umailin

Hello @Dan Sillito

Thank you for this information.

If you have already rebooted your machine and that did not help, please download and run our Clean Up utility to uninstall your current Nitro Pro and reboot your machine again:


NOTE: This clean-up tool will erase any existing signature files within Nitro so please save them to another location before using the clean-up tool in order to keep them. Please see this link for backing up custom stamps/signatures: https://kb.gonitro.com/knowledgebase#/search/stamps/000004509

When done, try installing the program.


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