How Do You Find (Or Determine) What Product Key Id Is Associated with Your Windows Computer?

Problem scenario
You lost your product key to your Windows computer. You find command prompt and PowerShell commands do not work to display the key ID. How do you display it (e.g., for upgrade purposes)?

Solution
Use this GUI (.exe) tool found here:
https://gallery.technet.microsoft.com/scriptcenter/Get-Windows-Product-6b5e6f6e