I believe it is either located in the root or the "includes" folder. If it is neither of these, it is in the "install" folder. If you still can't find it, try looking for default-config.php in all of the above folders.
I think it's quite interesting that most people in the retro "community" would actually go and work for Sulake to betray the very community that they have eaten, slept, and breathed almost their whole lives.