If Nitro PDF creator is not listed in Devices and Printers, an installation failure may have occurred and to further troubleshoot, follow these steps:
1. Close your Nitro Pro and MS Office applications if they're open.
2. Right-click on the Nitro Pro desktop icon and select Run as Administrator.
3. Go to Help tab > Support Tools > PDF Creation tab and click Nitro PDF Creator button. If the tool is not found in Help tab, you will need to go to the installation folder of Nitro Pro and run NitroPDFSupportTools.exe (by default, it is inside C:\Program Files\Nitro\Pro 13)
4. Installation will be done in the background. Once it's done, you should receive a message 'installation of the printer driver was successful’
5. Click OK > Close.