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Was just using Nitro Pro and the program locked up on a small .pdf file. Now when I open Nitro it says I have an Expired Trial. Clicking on Activate does nothing. Tried several times. Did a Windows 10 System Restore, same problem. Finally uninstalled and reinstalled Nitro and the same thing happens "Expired Trial". Went to support site and found:

Need Help Activating Nitro Pro?*
Follow these simple steps, and restore your productivity in seconds.
If you recently switched computers, upgraded your operating system, experienced a computer crash, or noticed that Nitro Pro has reverted to Trial mode, you may have trouble re-activating your license. To begin fixing the problem, please input your Nitro Pro serial number below and click “Find License.”

When I put in my serial number, a window pops up:

"licenses.go.nitro.com says 

"Please enter a valid serial number.


Not OK, because this is getting frustrating. I am using the serial # from the email when I paid for the program.


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  • Official Nitronaut
Allain Umailin

Hello @Tamiazzo,

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

I am pleased to inform you that we have release Nitro Pro that addresses this reverting to 'Expired Trial' issue so kindly update using below direct installers for the most updated build:

x32 http://install.nitropdf.com/professional_1391155/en/retail/nitro_pro13_ba_x86.msi 
x64 http://install.nitropdf.com/professional_1391155/en/retail/nitro_pro13_ba_x64.msi

If you are not sure which to pick, this will help:  https://kb.gonitro.com/knowledgebase#/search/64/000003790      

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

Should the program reverted to 'Trial' or 'Expired Trial' again, please do not hesitate to reach-out again by replying to this thread.

Thank you for choosing Nitro and I hope this helps!

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