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.