Cannot upgrade from Mountain Lion 10.8.5 to Yosemite , reaches 1.34 GB then 'Error has occurred'

Hi All
Sorry not technically minded at all.
Trying to upgrade my iMac which is running Software  OS X 10.8.5 (12F2518) to Yosemite, reaches 1.34 of 5.64 GB and states an error has occurred.
I've attempted this on numerous occasions and always with the same outcome.
many thanks in advance.
Jon

Try downloading it in the Safe Mode.
Safe Mode - About
Safe Mode - Yosemite

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