With Vectorworks 2014 that has been a change to the way that large content libraries are installed. There are now so many libraries to be installed that they no longer fit on the DVD, but they are all available after you have installed Vectorworks from the Vectorworks website.
At the end of the installation process you will be prompted to visit the website and install the library files. You get a choice over which files you want to install. When you drag the files into Vectorworks, Vectorworks moves the files to the correct location.