Yosemite will not load on Mac Pro running OS X v10.7 Lion

Started download from App store and would not install. Have tried many times but no success. Has anyone else had the same issue.

Hello Wayne.
I had the same problem with my MAC-mini Mid-2011.
I did download YOSEMITE three times.
I always had the same failure at my screen.
But now the fourth time the download went through completely.
My Timestamp now is Saturday, 12:00 o' clock AM Germany-time.
Because i don't know where you are living, i think when i tell you the time at CUPERTINO. They have Friday, 3:00 o'clock PM.
Please try the download again. I hope you will be successfully too.
Best regards,
Andrew (computerschmied)

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