i have been trying since release to get this to update. it downloads but won't update itself. when i manually try to install it i get to the manual instructions where we have to click the "shut down" button and nothing happens when i click it. the flashing just pauses when i click the button and then resumes after a second. i am running a 1.83 Core Duo macbook with 1gig of ram. i'm kind of at my wits end with what to do. any help would be appreciated. thanks.