At the very bottom of the opening page, one finds two pdf symbols, one over the other. The top one provides less quality (a smaller file for those on cul-de-sacs). The lower one has the quality I have come to expect, but is a much larger file. One should click on the selected file. The entire book should download. My download took about one minute, but I am on a very fast fiber optic internet connection. Once the download is complete, one should save it in the normal manner.
Note: The floppy disk symbol on the top only downloads the page being displayed.
The problem you encountered suggests that you did not allow the file to fully download.
Yours, in firm research - and solidarity,
"People united will never be defeated", eh.