Help with Rosetta Stone!

I downloaded the Spanish version first 3 volumes, they came as iso files.
I used Daemon and there’s bunch of files called .rsd in volume one.
What do I do with these files to get the app.
Answer #1
Google?
http://www.google.com/search?q=what+is+a+.rsd+file
http://www.ehow.com/how_7714028_open-rosetta-stone-rsd-files.html