1. download 酷6网视频下载器
2. use it to download video (video format is mp4, one video is separated to multiple mp4 files)
3. use "Any Audio Converter" (http://www.any-audio-converter.com) to change mp4 to mp3 file
4. use "Meda MP3 Joiner" (http://www.softpedia.com/get/Multimedia/Audio/Other-AUDIO-Tools/Meda-MP3-Joiner.shtml) to merge multiple mp3 files to a single file