Naughty
Not everyone has a D: partition, true.
Everyone has a C: partition, false.
But that's irrelevant, I just tried and the installer prompts you that the default location is not found.
I guess for most people that should be fine and they would select a different location, I guess I'll change it just to avoid any lazy people complaining that they have to click a button.
It does work fine, as long as the antivirus doesn't crap itself.