The following files are officially served by Udacity and should be accessible even if YouTube is blocked or if you want an offline access.
Video files are numbered and zipped per unit and contain a playlist file for convenience. You can use for example VLC player to play them.
In case you want to verify the integrity of these files after downloading, you can get the md5sum file for this class here.
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These files are officially served by Udacity from Amazon S3 and should be accessible even if YouTube is blocked.