How to install the Inspect tool on Windows 10?

Since 10.0.15063 the directory of the tools has changed. See the changelog:

To improve the developer experience, tools and metadata will lay down in versioned folders. This will allow developers to isolate the SDK and tools between releases.

You have to put the version of the Windows SDK between bin and x64 (or x86 or arm)

For me inspect is in the folder C:\Program Files (x86)\Windows Kits\10\bin\10.0.15063.0\x64

The folder C:\Program Files (x86)\Windows Kits\10\bin\x64 (without the SDK version) exists, but does not contain the inspect tool.

Needed Components for "Inspect":

Inspect is, indeed, included in the Windows 10 "standalone SDK" available from Microsoft here. Note the installer stub allows you to download several "features" (additional toolkits and utility packages) besides the Windows SDK proper. If all you want is Inspect, you can save yourself downloading about 300MB (650MB installed) of unnecessary packages by deselecting everything except "Windows Software Development Kit":

As for an alternative to Inspect, this answer suggests Windows Detective. Not having used the tool, I can't speak personally to its safety or suitability for the purpose, so caveat emptor, YMMV, May the Force Be With You and all that.

If you are using Visual Studio 2017, you can also install Inspect via the Visual Studio Installer.

All you need is to install the following feature, or a later version:

Windows 10 SDK (10.0.15063.0) for UWP: C#, VB, JS

After doing that you should find inspect.exe in the following location:

C:\Program Files (x86)\Windows Kits\10\bin\<version>\x64