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I cant open Nitro Pro 11.

Can anyone help.

I have tried all the thing suggested in the forums but cannot get it to work.

When i downloaded Nitro Pro 12 it opened fine but i couldn't enter the product key for Nitro 11.

What should i do?



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  • Official Nitronaut
Allain Umailin

Hello @AdamB,

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

Since you installed Nitro Pro 12 and you attempted to enter your Nitro Pro 11 serial number, you may have received the '-22 Error Wrong License Number' message. This means the serial number you are trying to activate is for a different version of Nitro Pro.

Let us reinstall your Nitro Pro 11 but first we need uninstall Nitro Pro 12 using MS FixIt:

After running this tool, kindly reboot your machine. After rebooting, please clear all your downloads folder or delete all downloaded Nitro installers. This step is important because we noticed that if you are saving all the installers and you download them in the same folder (like the downloads folder), the EXE can pick up any MSI installed in that folder and you may pick-up one of the older builds instead of the newly downloaded package.

Then download and install Nitro Pro using below offline installers:

x64 http://install.nitropdf.com/professional_1108470/en/burn/nitro_pro11_ba_x64.msi
x32 http://install.nitropdf.com/professional_1108470/en/burn/nitro_pro11_ba_x86.msi

If you are not sure which to pick, this will help: http://kb.gonitro.com/knowledgebase#/search/64/000001874

After installation, you can activate by opening Nitro Pro, clicking on the Help tab > About Nitro Pro > Activation and entering your serial number.

Thanks for choosing Nitro Pro and I hope this helps!

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