Jump to content

-20: Error - Invalid License Number


Recommended Posts

I purchased Nitro Pro yesterday, and was given serial number ********************* in my confirming email.  When I tried to activate it in Nitro Pro, I received the “-20: Error - Invalid License Number” message.  I tried the online activation portal and received the message, “Please enter a valid serial number.”

I read AllainU’s response Friday to a similar question, so I followed his instructions of removing the Nitro Pro 11 trial version and installing Nitro Pro 12.  But is still received the “-20: Error…” message.

What should I do now?



Edited by Leslie V.
Confidential information deleted
Link to comment
Share on other sites

  • Official Nitronaut

Hello Chris,

Thanks for reaching out to us!

Please uninstall the old version of Nitro Pro and install Nitro Pro 13. You can get the correct version 13 installers from this page: 

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

I hope that helps!

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.