It is not legal to download a 1080p copy of Avengers Endgame from any unauthorized sources. The film is protected by copyright laws, and downloading or distributing copies without permission is considered piracy. The best way to watch Avengers Endgame in high definition is to purchase or rent it from authorized digital retailers such as Amazon, Google Play, or Vudu. These platforms offer the film in various formats, including 1080p and 4K Ultra HD, and often include bonus features and exclusive content. Additionally, Avengers Endgame is available to stream on Disney Plus, which offers a subscription-based service that allows users to access a vast library of movies and TV shows, including the entire Marvel Cinematic Universe. It is essential to support the film industry and respect copyright laws by purchasing or renting movies from authorized sources.