Unknown Error - When trying to Upgrade to OS X Mavericks

I have a MacBook Air: 1.8 Ghz, 4 GB 1600 MHz DDR3. Running OS X 10.8.5 (Mountain Lion)
In the App Store, I see the free Upgrade available for OS X Mavericks.
I click on the free upgrade button to the right of the upgrade notification and then it asks me to enter my apple ID password (which I do) and it throws 2 errors
1st error - Unknown Error
I click OK (because thats the only option available)
2nd Error - We could not complete your request. There was an error in the App Store. Please try again later. (4)
I click OK (again because that is the only option available).
Cannot download the upgrade. Anyone know what these errors relate to?
Thanks!

I have home network (AT&T broadband connection - standard tier level/bandwidth)
I have been trying over my own WiFi since I can easily stream movies with no issue (Netflix, Vudu, etc.).
BTW - Macbook Air does NOT have any cat5 network cable connetion hardwired for this device. It only has firewire which is generally used for transferring data between 2 devices. So I'm not sure how I would connect any other way to my network than through WiFi.

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Unknown Error - When trying to Upgrade to OS X Mavericks

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