with a little investigation it's these that wont download, instead of retrying (did multiple times) I just hit next and all choice but these two were installed and appear to be running fine:
loading_screen_Roslich_640.7z - Custom Load Screen (?)
more_visible_torpedoes_splash_Yellow_pturbo_640.7z - also tried Blue verson, same hang.
A copy/paste into Notepad that shows what I was installing in total:
Aslain Install Notes.txt