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May 16, 2015 3:11 PM in response to Utboksby cosmicjay,Same thing, nearly, on a MacBook Pro 2009 previously running 10.8.6, trying to update to Yosemite 10.10.3. Hangs with "About a minute remaining" for an hour or so, so far. Went to Recover, tried to reinstall, same thing. I don't get any option in Recover to go back to previous system, which was working fine for me. I thought it was time to update, since I figured the bugs should have been worked out by now... Can anyone help me revert to the previous system?
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May 17, 2015 2:21 PM in response to cosmicjayby Eric Root,Try running the combo update.
Do a backup, preferably 2 separate ones on 2 separate drives.
Revert to a Previous OS X Mountain Lion
Revert to a Previous OS X - Yosemite
Revert to former OS from Mavericks
If you do revert, I'd use Setup Assistant to restore your data. This process takes a while, so do it when you won't need the computer for several hours, based on my experience.