From the site: - these are suppose to be downloadable, so if not, it looks like you should contact that site to find out how to do this.
11.Can I download these lectures?
Spoiler:
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Yes, you can if you have broadband connectivity and browsers like Firefox, IE 7 onwards, Safari etc. Please go to the website http://nptel.iitm.ac.in
For video courses, go to the course of interest. Under the "download" tab, all the lectures of that course are listed. Every lecture can be downloaded in MP4 or 3GP format. The size of the download is also indicated. Click on the mirror links provided, to start download. Video lectures are also available on http://www.youtube.com/iit , from which also you can download by using any browser add-ons.
For web courses, go to the course of interest. If it is a PDF, then do a "File-> Save as" in the browse menu and save file to your local machine. In case of other formats, mark the section of text required and copy into your local machine. We are working on providing downloads as PDF, for HTML lectures also.
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