The lecture series have been converted into pdf (Portable Document Format) documents, and require Adobe Acrobat Reader. If you do not have this free program, it can be downloaded from http://www.adobe.com/prodindex/acrobat/readstep.html. Deepnding on how you have your computer configured, the PDF may open in your browsers window. If you want to download the file on a PC, right-click on the lecture you want and select *Download file to Disk.* For the Mac, press the Option key and click on the file you want to download. Either way, be sure to note the name of the file because if you do not have a specific folder selected for net downloads, it could end up anywhere on your hard disk and you will need to do a Find for the file.