Trouble installing Sibelius Sounds
 

I am trying to install Sibelius 7 Sounds on my computer, but I cannot install the whole sound set.

I insert the program disc and click install Sibelius 7 Sounds. The sounds from that disc install, but it does not ask me to install the other content discs (3 content discs) that have the remaining data for Sibelius 7 Sounds.

How do I fix this problem, or is there an alternate (online) way to install the complete Sibelius 7 Sounds set?