George Koclanis 0 Report post Posted April 24, 2020 I am unable to activate Nitro Pro Ver 12 using the serial number I received when purchased. I have it installed on my desktop computer and am trying to install it on my laptop but am receiving an error message 20. When I followed the steps to Deactivate my activation number went from 1 to 0 and it said I had 2 remaining but I still received the error message 20 when trying to activate on my laptop. Can you contact me so I can get this working? George Koclanis Share this post Link to post Share on other sites
AllainU 0 Report post Posted April 24, 2020 Hello @George Koclanis, Thank you for reaching out to us through our Community Forums! Please be informed that '-20: Error - Invalid License Number' means the serial number you are trying to activate is for a different version of Nitro Pro. Looks like we need to uninstall the current version of Nitro Pro on your computer and install Nitro Pro 13. We then activate it using your serial number. Kindly follow these steps: 1. Uninstall Nitro Pro from your computer by going to Control Panel > Programs > Programs and Features then reboot the machine. 2. 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 installer in that folder and you may pick-up one of the older builds instead of the newly downloaded package. 3. Download your Nitro Pro 13 using these offline link/s: x32 http://install.nitropdf.com/professional_13162300/en/retail/nitro_pro13_ba_x86.msi x64 http://install.nitropdf.com/professional_13162300/en/retail/nitro_pro13_ba_x64.msi If you are unsure if your machine is using 32 or 64-bit, please refer to this link: https://kb.gonitro.com/knowledgebase/#/search/64/000003790 4. After installation, you can activate by opening Nitro Pro, clicking on the Help tab > About Nitro Pro > Activation and entering your serial number. Thank you for choosing Nitro and I hope this helps! Share this post Link to post Share on other sites