Assuming that you have downloaded the torrent already, that sound mix that you are asking can be found in this file:
English [eng] (dts-hd ma, 48000Hz, mono).dts
The 8 files that I mentioned above were copied from the audio stream of Harmy’s Empire Strikes Back Despecialized Edition, MKV container, so, the mono mix of the 1980 16mm version is in there.
It’s compressed though. He’s wanting the lossless file. I have it if you want but the sound isn’t any better. The source is very low fidelity so the garbage doesn’t get better with more bits.
EDIT: wait nevermind, if it’s DTS-HD then it’s lossless.