Something weird is happening with the downloads.
When you click the link, the resulting PDF can't be saved in that format, only HTM, HTML, or TXT. (with Firefox)
However, click the Download icon (page with down arrow) in the upper right corner & you get the PDF choice.
Or just print. I like to save them.
Not your fault, Les.
Probably Adobe again. They have completely changed the appearance & working of the Reader interface.
Their programmers have too much time on their hands.