CDombrowski48@Gmail.com 0 Report post Posted November 25, 2019 So my trial expired and I attempted to activate, but I received the "invalid serial number" message. I emailed and requested verification of the billing information and received the same serial number as I already had. Attempted to activate again, but received the same "invalid Serial Number" message again. Please explain how to activate when I have this problem. Share this post Link to post Share on other sites
Leslie V. 0 Report post Posted November 25, 2019 Hello, Thanks for reaching out to us! I am happy to assist you. Please uninstall the old version of Nitro Pro and install Nitro Pro 13. You can get the correct version 13 installers from this page: https://www.gonitro.com/nps/product-details/downloads After installation, you can activate by opening Nitro, click on the Help tab > About Nitro Pro > Activate and enter your new serial number Please let me know how that goes. Share this post Link to post Share on other sites
