To install the NPS extension, complete the following steps:

1 - Download the Visual C++ Redistributable for Visual Studio 2015 Microsoft Download Center

https://www.microsoft.com/en-us/download/details.aspx?id=48145

2 - Download the NPS Extension from the Microsoft Download Center

https://www.microsoft.com/en-us/download/details.aspx?id=54688

3 - Copy the VC++ Redistributable installer files and NPS Extension installer file to the Network Policy Server you want to configure.

4 - Install the VC++ Redistributable 2015 on the Network Policy Server

5 - Install the NPS Extension on the Network Policy Server

6 - Run the NPS Extension Config Powershell Script

The NPS Extension installer creates a PowerShell script at C:\Program Files\Microsoft\AzureMfa\Config (where C:\ is your installation drive). You must run this script to config the NPS Extension