Short answer is get the latest SDK or DDK (now called the WDK) for Windows. The newest version of the Debugging Tools are included in the latest of each of these.
Installation directory
These are the default installation directories for Debugging Tools for Windows:
- C:\Program Files (x86)\Windows Kits\8.x\Debuggers\x64
- C:\Program Files (x86)\Windows Kits\8.x\Debuggers\x86
Excerpt from: http://msdn.microsoft.com/en-us/library/windows/hardware/ff551063(v=vs.85).aspx
Start here for an overview of Debugging Tools for Windows. This tool set includes WinDbg and other debuggers. The driver development environment and the Windows debuggers are integrated into Microsoft Visual Studio.
•To set up the integrated environment, install Visual Studio and then install the Windows Driver Kit (WDK). Debugging Tools for Windows is included in the WDK. You can get the integrated environment here.
•If you don't need the WDK, you can get Debugging Tools for Windows as part of the Windows Software Development Kit (SDK) for Windows 8.1. You can get the Windows SDK for Windows 8.1 here.
•If you want to download only Debugging Tools for Windows, install the Windows SDK, and, during the installation, select the Debugging Tools for Windows box and clear all the other boxes.