A little below your post in here, has the information you’d likely need:-
Some info & help for TN1’s 4K77, 4K80 & 4K83 projects of the Original Trilogy…
Basically, go to the forums on thestarwarstrilogy.com, read the rules and requirements, register, be patient, have a look around, and you’ll find the information you need to acquire these 4K77/80/83 projects 👍