It's not the installation that's the problem - it's that you're selecting the folder as a DAZ|Studio content directory, not a Poser content directory. Look at the two different icons in Jen's screenshot - the Studio entry has a folder icon with a stylised S, that's a D|S content directory (.daz scene files and .ds/,dsb scripts including presets) while the Content  entry has a plain icon, that's a Poser content folder and it skips straight to the library categories, with appropriate icons, instead of showing the Runtimelibraries folders en route. You switch what you are selecting using the long button at the top of edit>preferences>directories (what Jen called a drop down menu).