I was not sure when Microsoft AutoUpdate did not work for the first time. I could not update all my Microsoft softwares like Microsoft Word, Microsoft Excel, Power Point, and also Microsoft Edge as my primary browser.
Checking available updates always gave me this alert.
After searching for solutions, I found that the easiest way to fix it is by re-downloading Microsoft AutoUpdate (MAU) from Microsoft site.
Go directly to Release history for Microsoft AutoUpdate (MAU and download the latest available download. Once I have it installed, I can download the available updates