Okay, it turns out that I was just not using GetASFstream correctly. I got the hidden URL with Project URL Snooper and then put it into the URL box on the main screen of GetASFstream ... not correct! I found that if I open the web traffic analysis screen (from the "File" menu), then paste in my URL and click "analyze", it then worked perfectly. I gather that GetASFstream should be able to scan traffic and find the right URL (so that I don't need to do the initial step with Project URL Snooper) but I haven't been able to figure this one out ... sure would be nice to have an english language tutorial for GetASFstream!