Just download the media installation tool and update through that, it should put you straight on the latest one:
https://www.microsoft.com/en-us/software-download/windows10
And usually it's faster to download if you need to skip a couple of versions, as up until the 20H1 version, each major update was basically a windows reinstall. Big change from there is that those major updates are not installed similar to KB updates, so way smaller download sizes and faster install (the 2004 will still be slow as it's the one that sets it up I think).
1MB/s, ouch.
Why are you using Norton anti-virus? Just use Windows defender.