By ATS member's point, I've been using YTD video downloader to save Youtube's video for a month, but the software has crashed several times, which
caused some links I found accidentally in Youtube missed.
So how could I find those links back?
As long as you haven't turned off the history function of your YT account, you should be able to find what videos you have viewed starting from the
most recent.
Also, check out YouTube to MP3, an app made by MediaHuman. It's never failed me. It works to convert the video to MP3 format as well as standard
video files like .avi & .mpeg if you're inclined.