were you downloading several at once ? From what i understand that has caused issues in the past.
there were i gues as many as 40 files to download for capture to print
the interface for the downloads allows for 6 at a time - i was indeed loading them 6x6...
for me it unfortunatley, was an unmitigated disaster - others i am sure may have much different results - i think my pitfall was i did not pay close enough attention to what was going on with each individual download...
the ff addon would manage the download and make it seamless
i tried it on another location with many links to download files... and it works
in the morning all files were nicely awaiting in my downloads dir.... from only one actuation...
i highly recommend using this addon