The DAZ folder is where Hexagon, DS1 & DS2 got installed to, DAZ 3D is where Bryce7, DS3 & DS4 get installed, I’m assuming Carrara is the same but I don’t have it to be able to check.
Some of the older DS native content get installed into program files by default, and there’s no way to change it as you don’t get any options with the installer, things like the early Elite textures, for me in those instances I let it install to where it has to go, I then move the installed files to where they need to go, either to my DS3 content directory on F drive (large partition) or to My_Library in Documents for DS4.
Before Vista was released the DS1 & 2 Content directory was stored in the “Program Files > DAZ > Studio” folder, after Vista’s release keeping it there caused a lot of headless chicken routines around the community, as well as a lot of bad information that confused the situation even more.