How to have audio working when using Windows "N" edition?
This version come with no support for media-related technology. If you try to use Maps Pro with that version of Windows, you won't get any voice instructions
To fix that, you will need to install the Media Feature Pack from Microsoft.
For Windows 8.0
http://www.microsoft.com/en-us/download/details.aspx?id=30685
For Windows 8.1
https://www.microsoft.com/en-us/download/details.aspx?id=40744
For Windows 10
https://www.microsoft.com/en-us/download/details.aspx?id=48231