: A popular "ID" version from his live performance at Ultra Music Festival 2016 is available to stream on SoundCloud.
: Offers several free download options for community remixes, such as the Teco Remix . Avicii Without You (Demo) mp3
: Provides a free download for the Ryder Sinclair Remix . Official Releases Avicii - Without You (feat. Vargas & Lagola) (First Demo) : A popular "ID" version from his live
: This site lists several community-uploaded tracks, including a Without You (Part 4) MP3 and various remixes . Avicii Without You (Demo) mp3
While there is no single official "article" for an MP3 download, several platforms host demo versions and remixes of Avicii's "Without You" featuring Sandro Cavazza.