Used to be the best video downloader hands down, worked on multiple platforms. Now it only works in windows, no longer works in linux. Completely useless.
Unfortunately at this moment Native Application is only available for Windows systems, versions for Linux and Mac OS X are under development. Linux and Mac OS X users still can install old AVD version in Firefox 56 and below from Mozilla website here: https://addons.mozilla.org/en-US/firefox/addon/video-downloader-player/versions/
