HawkDawg, the links for the paid version are only for the installer version, and are visible in Is Sweet Home 3D free? section of the FAQ and the Download page for Windows users and some Mac OS X users when it applies (it mustn't be the case for ElfenM who runs a version of Mac OS X that doesn't support the paid version available in the Mac App Store).
As explained by ElfenM, the Online version includes the free 3D models and textures libraries available at http://sourceforge.net/projects/sweetho ... 3D-models/ and http://sourceforge.net/projects/sweetho ... -textures/.
These libraries are also included in the paid version.

For more details about why I chose to distribute also some paid versions along with the GNU GPL versions, please read this thread and the OpenCandy offers removed from Windows installer section in this article of the blog.