Project 4K77 is a crowd-sourced, non-commercial restoration of the original, unaltered 1977 theatrical cut of Star Wars . It was scanned in 4K resolution from original 35mm film prints (specifically a 1977 "Eastman Kodak 5384" print) to preserve the movie as audiences first saw it—before George Lucas’s later Special Edition changes (e.g., Greedo shooting first, CGI creatures, added scenes).
If you only care about convenience or don’t mind the Special Edition changes, stick with Disney+. But if you want to experience the original, gritty, analog magic of Star Wars on a 4K screen, Project 4K77 is worth the effort. project 4k77