Why am I receiving an unknown error message when try to upgrade OS 10.8 to Yosemite?  It also says "There was an error in the App Store. Please try again later (4)."

Why am I receiving an "unknown error message" when I attempt to upgrade my X OS from 10.8 to Yosemite?  It says "There was an error in the App Store. Please try again later (4)."  This happens only when I check for updates/upgrades for my software and then try to upgrade Yosemite in the App Store. Thanks for any help!

Hi.
I'm having the same problem. Could you tell me how you resolved it.
Thanks
Aliquatpat.

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