I then called Sonic support and got someone who had vaguely heard of WordPress but didn't know that Sonic had an installer for it. I then said it was fine with me if Sonic did the installation; the installer page says, "If you'd like us to install WordPress, please let us know where to put it." The phone rep checked with a supervisor who said they didn't handle such problems.
I've been telling people for years and years how good Sonic's support is, but if I can't even get support for one of your own member tools, that's very sad. Can someone at Sonic please figure out why the automated installer isn't working so we can fix that and I can do the installation myself. Or, alternatively, go ahead and install it yourselves in the specified directory? Help, please!