What is ADPlus and where can it be found?

What is ADPlus and where can it be found?
From where ADPlus can be downloaded?
Where can I download ADPlus from?

ADPlus is documented at https://support.microsoft.com/en-us/help/286350/how-to-use-adplus.vbs-to-troubleshoot-hangs-and-crashes
It is used in order to obtain stack traces of crashing or hanging processes under Windows.

Per the article:

Where do you obtain ADPlus?
ADPlus is included with the latest Microsoft Debugging Tools for Windows. To obtain the latest Microsoft Debugging Tools for Windows, visit the following Microsoft Web site:
https://www.microsoft.com/en-us/download/details.aspx?id=49924