Downloaded win10 ISO, pro version, wouldn't boot in Vbox without EFI turned on.
Then found that my MAPS key wouldn't work, so downloaded the Enterprise ISO. this wouldn't boot in VBox unless I turned EFI off.
Trying to download it on a windows7 PC using IE11 (sometimes MAPS insists) I got "4 hours and 15 minutes left"
So out of interest I tried on a Linux PC using Firefox, the download took 9 minutes, same site, same file, same network connection.
Maybe Linux users get priority :)