I'm trying to download this video from
YouTube. I have tried FlashGot and Video DownloadHelper as Firefox extensions and a couple of online services which provide downloading videos from
YouTube without success.
The strange thing is I can download any part of tutorial (total of 14 parts) except parts 2,4 and 8. When I download those parts the video has a single frame of picture (no videos in fact) and related sound.
How can I download those parts?