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IMAC won’t update OS from 10.5.3 to 10.5.6
greetings
i am currently volunteering at a middle school broadcasting class. our imac is currently running 10.5.3. when i click the “look for updates” it comes back with the 10.5.6 update-but when i select the update and try to download, the dialogue window for the downloading appears with a time-remaining progress bar, but the download never proceeds–the time-remaining status bar doesnt progress and the dialogue says the machine is “preparing for the update”, and the download and update never proceeds. Any idea whats wrong here – and how i can get the imac updated?
cheers-jimb