Remember: If a product is worth using for free, it's worth paying for to support the developers. Video Downloadhelper has been actively updated since 2007—that’s nearly two decades of keeping up with streaming wars. They’ve earned their premium price.
However, the internet is complex. Modern streaming sites use fragmented delivery systems (HLS, DASH, M3U8 playlists) to serve video in hundreds of tiny segments. The free version of Downloadhelper handles basic detection, but the provides the "de-scrambling" engine required to reassemble these fragments into a single, seamless MP4 file. Video Downloadhelper Premium Download