It seems to be random but I have pin pointed the bad part of it.
It seems it will not take T3 or higher but if you have a T3 that has
not been downloaded at all it will do the download. T1 and DSL
are both in that same category you just have to guess on which one that has no downloads. Thats what I have so will keep you
informed on the progress and will post as much info as I can to help.