Thank you so much, Protocol Droid for sharing this and your mum for the recording, if she only knew that people around the world would be able to listen and appreciate this 35 years later when she recorded this. :)
Like everyone else already said, the audio quality on it is unreal, absolutely amazing! This gave me goosebumps on more than one occasion, the audience reactions reminds you how innocent and fun this movie really is, after watching this film so many times you often don't reflect over certain lines and situations as you're so used to them, it was a little bit of magic to hear the reaction to the bickering droids, when the mouse robot got scared, Solo's and Leia's witty lines etc. Great job, Puggo. Thanks!
I must also add that I was actually surprised by how silent the audience was in between, have heard stories about how wild the reactions in US theaters can be, (maybe exaggerated and false) here you got the impression that they were really captivated by the film. But who wouldn't, it was Star Wars. ;)