Can't launch 1.5.152 - .exe and drivers missing?

I just got a new Arduino Due, and I need to install 1.5.1r2 to program it. I downloaded 1.5.1r2 and unzipped it. There is no "arduino.exe" in the root as there was in my 1.03. There is no installer and no executable, nothing but dll's. How do I install or launch it! Also, the drivers folder is entirely empty. The file structure is there but there are no drivers present. I am running Windows 8 (!%^@).

Please help!

Clear your internet temp files and try again, or with another browser.

I downloaded it in Internet Explorer instead of Chrome, and unzipped it in 7Zip instead of Winzip. One of these two removes .inf driver files and .exe executable files?