Howdy all. So i have a mac book with OS 10.5.8 and a version of Garageband 4 on it. I am trying to open GB files that were created on a GB5.1 version. The error i am recieving: "CAN'T OPEN SONG This song requires a newer version of GarageBand. Please update to the latest version of GarageBand before opening this song". I've downloaded GaragBand 5 update but when I try to install it I get another alert. Any help would be greatly appreciated. THANKS!