When I download from the current green icon on the home page, Windows offers me "Run" or "Save as". I chose run and got an error message from the system - see file attachment (which was taken with Windows Snipping Tool). There is no great problem because download with "Save as" and subsequent execution provided a successful install. Nevertheless I thought you might like to know about the failure.
This is Windows 7 64-bit and I am relying on the operating system for unzipping - there is no WinZip installed.