You can install Inspect.exe in multiple ways, one is you download the Windows SDK following this link or you can get the file from here.
However the file uploaded on GitHub is the old one so it is recommended that you use Inspect EXE as a part of Windows SDK. Once Windows SDK is installed on your Windows 10. Follow below steps:
Step 1: Navigate to C Drive Program Files (x86) and then Windows Kits
Step 2: Navigate to bin folder for your operating system version, my one is 10, you might have 8 or 11
Step 3: Open latest one from 10.x or you can open any
Step 4: Open x84 or x64 or arm one if your cpu architecture is ARM
Step 5: There you will find inspect exe
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If you don't want to install…
If you don't want to install Windows SDK just for Inspect.exe you can use Automation Spy tool from here: http://automationspy.freecluster.eu/