GTRider87 Posted November 19, 2019 Report Share Posted November 19, 2019 (edited) 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? Chris Edited November 19, 2019 by Leslie V. Confidential information deleted Link to comment Share on other sites More sharing options...
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
Already have an account? Sign in here.Sign In Now