curl -O http://image.slidesharecdn.com/PATH-TO-SLIDES[1-50]-1024.jpg && convert *.jpg PRESENTATION.pdf
...to save a local copy. You need to view the page source for the URL and adapt the bracketed number of slides, but I used this previously and it worked well enough. I won't log in or even create an account so this is how I do it instead.
Searching now, it seems someone else has written a bit of public documentation (non-English) about it: https://github.com/jrlambea/scb_file_anatomy
What helps a lot, is copy and paste to an excel, like this Cell A1: http://image.slidesharecdn.com/PATH-TO-SLIDES Cell A2: 1 Cell A3: .jpg then pull the A2 till the number of the slides (e.g. 50) So you end up with 50 lines. Then copy all that 'table' and paste it to a Notepad Then Replace (Ctrl+H) the 'tab' to null Then Ctrl+A and Copy from the notepad Then paste it to IDM Download all Have a good life.
=A1&A2&A3
Then just copy Column A4. Now you don't need to replace tabs or such.
Note: This will give you path like ...SLIDES1, SLIDES2..., SLIDES10 etc. If you want 1,2,10 to be 01,02,03; Use this instead of A2, TEXT(A2, "00")