For those that don't have access to a computer booting Windows, I managed to make it work (or at least to make it seem to work) in XP 64-bit under QEMU.

I have to say that I did not finish the download (it was taking too long and I had to vacate the computer), and I ended up downloading the maps in a Windows computer at work, so YMMV. But I see no reason for it not to work. :-)