Click on presentation you want to download and save. Most files are in PowerPoint format and some are Zipped (compressed) for more secure download. You may need to "unZip" (restore) the file for use if your operating system cannot work with a Zip file natively (most can). Alternately, you can right mouse click the presentation you are interested in, then save the file by selecting "Save Target As..." or "Save Link As...". Some of these files are large and may take a while to download.