I am going to ignore the posts here that talk about "theft", Illegeal usage" and so on, it is just plain ridiculous. Please if someone posts a legitimate question here, do not give your stupid opinions. If you don't have an answer, then don't post such silly stuff.
As to the question of which one I am using, it is just called you tube downloader by altervista.org. I did check their site and they say they are coming out with a newer version and they are aware of problems with this one. I am hoping they can fix this issue as I use it a lot...