"This is the rare UK Channel 4 documentary about Blade Runner, giving insights into it's history with interviews of Ridley Scott, the writers and nearly all the cast. (...) There is also a tour of some locations, most notably the Bradbury Building and the Warner Brothers backlot that was the LA 2019 streets, which look very different from Ridley's dark version.

The documentary then details the test screenings postproduction editing/changes (voice over and happy ending, deleted Holden hospital scene), special effects, soundtrack by Vangelis, and the unhappy relationship between the filmmakers and the investors; which culminated in Deeley and Ridley being fired but still working on the film. The question of whether or not is a replicant surfaces. After being a "disaster" in the box office (a financial loss initially) Blade Runner was reborn in the video rental market, and a great reception of a chance screening of Ridley's workprint at the Fairfax Theater, Los Angeles, in May 1990 led to Warner Bros. having the 'Director's Cut' done by film archivist Michael Arick."

IMDB

Torrent: On the Edge of Blade Runner

What happened to the Blade Runner Special Edition DVD?