It's an exe file. First you download a downloader, and it grabs the main installer.

Then there's a much smaller content zip.

Also, there is a patch available, and a fix for the content installer (jut in case they never updated the original files)

Why not download it overnight? Now that the mad rush is over, I suspect it won't take long depending on your connection speed.

Way too many people take way too many things way too seriously.