"Reqested control unit: 'DME331, DM331k20' not found. Control unit found: "
I presume this is the error that's confusing you. IMO, this doesn't refer to the files in your computer, but to the actual DME in the car. Basically, after you select the DME331 from that menu, INPA tells you that it wasn't able to find that control unit in your car.
"Control unit found" would return the DME found in your car, if INPA would have the files for it and if it was able to automatically recognize it. But it doesn't, so it's just a blank after the ":". Meaning that it can't find any known DME's.
Hope it makes sense.