Any attempts result in a pop up box saying rather cryptically “AutoUpdate Cannot Connect to The Update Server”. However, after reinstalling Office 2011 for Mac from a back-up dmg file, I was unable to use the built-in Office autoupdater to get any updates.
That’s the last version that I have purchased from Microsoft and although already 7 years old at current time of writing, it still works perfectly fine and I see no reason at all to upgrade to Office 365. I recently did a clean install of my iMac to OS X Mojave, which required of course reinstalling all my apps, including Microsoft Office 2011.