How to install OpenXML SDK Productivity Tool 2.5 on Windows 10

Question

I downloaded the OpenXML SDK Productivity Tool 2.5 from Microsoft\'s Website

However when I want to install it, I get told I need to install .NET Framework 4 first and th

Answer 1

The "Install Instructions" here: https://www.microsoft.com/en-us/download/details.aspx?id=30425
Say the following:

Double-click the OpenXMLSDKV25.msi or OpenXMLSDKToolV25.msi program file on your hard disk drive to start the setup program.

It reads like you may do one or the other.
Like the smaller file may download only what you need, where the larger file contains everything you might not need. WRONG!

All this time I had been trying the 25MB OpenXMLSDKToolV25.msi file and seeing the same error.
I downloaded the 2.5MB OpenXMLSDKV25.msi file, ran that with no errors, but still nothing installed.
Then I ran the OpenXMLSDKToolV25.msi file and now I have the "Microsoft Office Open XML SDK 2.5" installed as an app and I verified it works.