Hello,
The base url
http://dl.javafx.com should respond with a 404 (generated by GlassFish) when accessed directly, since it has no index page. If you can access the file:
http://dl.javafx.com/1.3/javafx-rt-lazy-windows-i586__V1.3.1_b101.jar from a browser, then the JavaFX server is functioning correctly (it is right now, at the time of writing this). If you're still unable to install loadUI using the installer at this point, then the issue may be related to your proxy settings. If you connect to the Internet via a proxy then this proxy information needs to be entered into the loadUI installer for it to be able to download and install the JavaFX runtime.
Regards,
Dain
eviware.com