Hello anyone who's still out there! I finally, finally managed to release a beta of the newly re-compiled AQ for Mac and Windows. This compiles and runs on OS X Mavericks and Windows 8.1 (and hopefully earlier versions, though it seems we still have some issues with XP). There is no install process necessary; just download, unzip and run AudioQuake.app (Mac) or AudioQuake.exe (Windows). Other than this, I hope it seems very familiar.
Please note that there is an issue with Windows Firewall the first time you run it -- you'll get a pop-up dialog to explain what the issue is; hope that works. I do expect some teething problems, but equally I have been testing this so hopefully it'll work OK for you. Once this is working nicely, I would like to integrate the Level Description Language into AudioQuake's download, so that they are bundled together.
Whilst I appreciate that AudioQuake the game is of largely historical interest now, I feel it's important to get Level Description Language into people's hands, because I gather that there aren't many similar tools out there (though would be very happy to be wrong about that!) Either way, I wanted to preserve this stuff for at least a while longer.