Nobody answers so I continue my monologue :-) and I have a good news! According to this video - http://www.youtube.com/watch?v=difZ95qsi5U&feature=related (look at time 0:50) it is now sure that the 97 SE version!! of ROTJ was broadcasted on Pro7 about 3 years ago!
So all we have to do is to find someone who recorded this broadcast and we will have a HQ 97 SE ROTJ!
Any ideas who could have this recording?