Sounds
familiar. Other than the (not terribly useful) responses listed in that thread, my queries have also gone unanswered.
After sending countless emails I had pretty much given up, but just for the heck of it I went up on underworldlive.com again last night and tried entering my purchase code for the Nth time, and this time it worked!! I was kind of shocked, but was also finally able to download what seems to be (?) a complete copy of the
Big Sister WAV file.
But that raises the question: How did you know how long the WAV file was supposed to be? I haven't seen anything indicating exactly how long the files should be, or any sort of checksums.