1. The download.asx file has to be under one of web site, legal URL path. Like
http://(your_web_site_host)/download.asx
2. New version of Net Transport (my current 2.11.311). Before I had old version didn't work.
When I wrote here, I know this might not a good suggestion to everybody. Because doesn't everybody have a web site.
閑雲孤鶴, do you have Web Hosting link?