How to fix error:
'N' is not a valid character in a Product key.
When you get this error, it means that you used the wrong installation.
This is how the error looks like:
Please follow the instructions below for the correct installation steps for Office 2016 Professional Plus:
1. Go to setup.office.com
2. Use your Microsoft account to login or create one.
3. Enter you product key
4. Choose the language you want office to install it and press next.
5. Now you can click on the download button to download Office.