I did add wusa like you mention when I realized it was just not even running but still not working
now I am getting no error code but I have it set to timeout after 5 hours and after letting it run for 5 hours it times out.
It is downloading, so I know that work
I did find some more info when trying options today, when not doing quiet, and showing the dialogs it appears to say its copying to update cache and never seems to go any further.
If I set it to run as the logged in user without silent switches it does appear to run ok, but with the gui, adding back in the quiet options as the logged in user times out again
It is baffling me.
I did also download a new version for 1709 which works even though we are on 1703, so tried that with the same results