Welcome to planetasian.blogspot.com .
You can watch a collection of videos here and you can also download all.
To download videos such as youtube   you can try  IDM downloader .
You can download IDM ver.6.05 in here

Download File.1`
Download File.2`

After you install IDM on the CPU,
you only need to click the play button on the clip you want to download,
wait a few seconds, IDM icon button will appear , click on download.
You can continue watching a video or shut it down ,
because the download IDM will keep running .