The Saitek site has the wrong URI for the driver files. They're still hosting them, though.
Just right-click the download drivers button, copy the link location, paste it into your address bar, and remove the "pub", so:
ftp://ftp.saitek.com/pub/software/fu...ler_SD6_64.exe
becomes:
ftp://ftp.saitek.com/software/full/S...ler_SD6_64.exe