No, fellows, that's a strange rubbish page that yields nothing. I wasted time on it earlier myself.

Go here to download Sibelius Scorch (11 Megs) and install it:

http://www.sibelius.com/products/scorch/index.html

I double-checked, and that definitely fetches the complete Opus music font along with the program. Once in Windows, the font is available to BiaB and other programs. "Scorch" is an official Sibelius browser plugin that lets you open, read, and print their notation files without buying Sibelius.

After you double-click the setup program, open your browser; a quick install process will start. You can possibly uninstall the plug-in without losing its font.