Update failed, but not before uninstalling current version

Installer says install failed, and I should log in as administrator. I am logged in as administrator. I am always logged in as administrator. I am the only person who uses this machine. Update did however succeed in uninstalling my current version, so now all my libre office documents are useless. Turned off anti-virus and tried again; same result. Never had any problem installing or updating LibreOffice before. Any ideas?

Restart your computer, and try again.

Dude! That totally worked! You must be some kind of genius!

It’s Windows, so…

And btw, working as Administrator is never a good idea, but… that’s off-topic here.