Tried to install Yosemite on my Mac mini last night. It froze on the progress bar on restart. There ensued three hours of trying to figure out how to get out of that, force restart, try again and finally very slowly finding a way to backpedal into Mavericks. At least I wasn't doing it in my MacBook Air which has all my work in it. That was a bit of a waste of an evening...
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