The Key to Rebecca was produced for television in the mid-1980s. Original broadcasts were in standard definition (4:3 aspect ratio). Any digital file labeled as a "2021 web rip" or "remaster" is still limited by the quality of the surviving master tapes or DVD releases.
While availability fluctuates, legal platforms like have carried the title in the past. It is worth checking "JustWatch" or "Reelgood" in your specific country to see if the 1985 miniseries is available for rent or digital purchase.
