DevCon is a Windows command line tool useful in Windows device testing and debugging that is not included in the general availability release of Windows 8.1.
Additional details on DevCon’s use are here.
Here are steps to install it, along with useful prerequisites.
1. Install Windows 8.1 WDK.
2. Install Visual Studio Express 2013 for Windows Desktop (or a full version of Visual Studio, if available).
3. Install the Windows SDK for Windows 8.1.
Below is a screencapture showing correct command syntax- note that it is necessary to “quote out” the full path of the appropriate bittage .exe version as shown in the 2nd line.
C:\WINDOWS\system32>"C:\Program Files (x86)\Windows Kits\8.1\Tools\x64\devcon.exe"