exe.installer [I think!]
I don’t know if this is retrievable or not. Attached is a short clip from my Dad’s Funeral Service. Someone set the machinery up incorrectly and although his Service was recorded, the singing & speech is drowned out by a buzzing sound.
I can get “a bit” of improvement using a custom Nyquist script in the Nyquist Prompt effect (http://manual.audacityteam.org/o/man/nyquist_prompt.html). The recording is pretty bad, so the results are not going to be good.
This is what I can get, but the later part of your extract comes out worse:
Unfortunately, once the amount of hum is reduced, it becomes obvious that there is also a lot of other damage to the sound. Perhaps the mic was not plugged in properly, or the mic cable is damaged.