I’m using the latest version of LibreOffice for MacOS and I cannot get the live/Internet based update to work (see attached screenshot); here is the specific version information for LibreOffice:
Version: 6.4.4.2
Build ID: 3d775be2011f3886db32dfd395a6a6d1ca2630ff
CPU threads: 16; OS: Mac OS X 10.15.5; UI render: default; VCL: osx;
Locale: en-US (en_US.UTF-8); UI-Language: en-US
Calc: threaded
This does not happen with, for example, OpenOffice (which I stopped using), or other applications that update. I do have a privacy firewall that blocks certain pernicious activities, but I can’t imagine that would apply to LibreOffice. I disabled my filtering firewall, and it still happened.
It’s not clear to me where the problem is otherwise.