Can you not download from Archives anymore? It's been a year since I've tried and it's not working 
??? Yes you can, just not the soundboard recordings, look for the audience recordings.
Here's a random sample: http://www.archive.org/details/gd1987-0 ... eok.flac16
scroll down a bit...
you can download the Flac files for better quality or mp3s...
Are you downloading FLACS? If so most programs, such as WINAMP, need a plugin to playback FLAC files. If MP3s, then you got more of a problem cause Windoze Media Slayer isn't recognizing the file (or whatever player you are using). See if you got the files in a folder on your computer disk. I personally download FLACs from archive.com and then convert them to .wav files using one of many free utilities. Then I either listen and enjoy or I scrunch them down to MP3s and try to enjoy.