so i recently installed itunes version 8 on my mac, everything was alright until i went to update the software on my iphone. i did some searching and read that version 8 wont let you install the iphone software. i want to go back to version 7.7.1 of itunes but whenever i try to install it, i get this error message: "You cannot install iTUNES on this volume. A newer version of iTUNES is already installed." how do i go back to the older version i had so that i can update my iphones software? HELP!