I'm willing to bet there's gonna be loads of people having problems installing because they choose the wrong directory. You need to select the parent dir of the "Diablo-III-8370-xxxx-Installer" dir, not select that dir itself. A friend of mine made the error himself and ended up with a "Diablo-III-8370-xxxx-Installer/Diablo-III-8370-xxxx-Installer" dir. Then people just go into the first one not realising that is the unupdated data and get errors.