By accident, I've found a way to get all the vdo. First extract first 14 rar files. Then extract the last three rar files, i.e. 20, 21 and 22. In that process you will get session 1,2,3,4,5,9 & 10. After that you have to download, part 8,9,10,11 &12 of trduraikamaraj's post. Then rightclick on part 8 and extract. Although it will ask for previous volume, don't worry, it will extract those volume which are complete. In that process you will get session 6, 6a,7 & 8. But you have to download extra 700 mb. Any way you will get the entire material.