A family of Microsoft word processing software products for creating web, email, and print documents.
The download link is https://gregmaxey.com/word_tip_resources/Content%20Control%20Insert%20Utility%20Dialog.zip
If you aren't familiar with installing template add-ins, here are the steps:
After the zip file downloads, right-click it, choose Properties, and check the box for Unblock. Then unzip the file to get the .dotm file, and store that in the folder C:\Users[your name]\AppData\Roaming\Microsoft\Word\Startup.