It's not very intuitive, so here's how to download the PDF:
1) in the upper right hand corner of the PDF, click the little box to open the PDF in a new window.
2) In the new window, on the left side you will see two options: File and View. Click on File to open a submenu.
3) On the submenu select Download Original.
The file size is about 24MB, which is close to the 28MB of Phil's Seven Seas PDFs.