Updating to 10.14.6 giving internet connection error
I'd download the full combo updater from a web browser - that way you should be OK through retries &amp; you know that you have the entire file safely on your Mac before committing to the actual update.

Google can always find these easily, using 'combo update 10.14.6' &amp; it will always be first hit.

https://support.apple.com/kb/DL2010