"KVS" is not a mainstream video player like VLC or MX Player. It is typically associated with KVS Video Player for Windows , a lightweight application, or KVS Demo Player (used for protected educational videos). The method for downloading videos depends entirely on which specific player you mean.
Fluid playback across desktops, tablets, and mobile devices. Reliable Methods for KVS Player Video Download kvs player video download
A premium tool that adds a "Download this video" button directly above the KVS player. 3. Command-Line Tools (Advanced) "KVS" is not a mainstream video player like VLC or MX Player