Using .iso files? (Downloaded a program)

Hello all,

I have recently downloaded the Rosetta Stone program from a torrent, and it gave me a .iso file, the icon of which resembles that of .dmg file. When I open it I get another icon on the desktop of the little white disk hard drive thing (the same icon for when you insert a USB disk).

When I open up the file there are 4 folders, but none of them do anything. Any idea?

maybe you should buy the real version from the shops then?

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Thank you.