I managed to download the maps again. took a long while and lots of tries
a) i found that in the Android notifications it shows ‘n files being downloaded’ there is some of of progress meter, while the one in DMD2 shows nothing for a long while, but later kicks in
b) some maps consist of several files )map, route file (n), where n seems to count down from some number to 1?) maybe a poi file. Makes it hard to see if it completing soon
c) it seems that updating a map deleted the prior version of the map in local storage , so that if that download fails one lost the prior version also. It really should download the files to temp storage and then link/move them in place only if complete/verified?