Ich hoffe doch, du besitzt einen Androiden. Wenn dem so ist, lad dir mal Videoder herunter. Damit sollte es funktionieren (nur den Link von diesem Beitrag kopieren und dort einfügen).
As long as you're getting the apk from a trusted source (I recommend just going to videoder.net), then yes it's completely safe to install.
Here is there guide on how to install their app: https://www.videoder.net/how-to-install-videoder-on-phone
Videoder is the best app to download youtube videos if you're on mobile. It can even download entire playlists or automatically download new videos from specified channels.
^(not sure if it is available for iphones though)
Thanks a lot for the answer, however unfortunately it does not work. Won't download from the link I provide, probably because the video is only visible to the account.
Also Amazon Video does not show on their site list: https://www.videoder.net/desktop/sites
Videoder is a completely free YouTube Downloader that IMO looks better than regular YouTube. It also has a system-wide overlay feature that asks if you want to download something when you copy a YouTube link. I use it to download 90% of my music. You have to have outside sources enables, they took it off the play store a little while ago.
If you want music mp3 files then use fildo http://fildo.net/android . If you want to download YouTube videos in multiple formats including mp3 then get videoder https://www.videoder.net Both apps continue to get updates.