App Store - Error 13 - Cannot download/install Mountain Lion

Hello,
I tried to upgrade to Mountain Lion via the App Store on my early 2011 MacBook Pro running Lion OS X. Whenever I try to purchase Mountain Lion I am greeted with an error 13 message. I have followed the various other forums suggesting I delete file ~/Library/Cookies/com.apple.appstore.plist in the App Store cookies however this fails to work.
I have also tried the following:
Per post above, enable debug menu via
defaults write com.apple.appstore ShowDebugMenu -bool true
Sign out
Clear cookies AND reset the app, using debug menu
Select Menu->Store->Check for unfinished downloads
Wait for the downloads to finish and then
restart the app store app.
But it failed to work! :(
Thanks in advance for any help as at the moment I am unable to install Mountain Lion and it's rather annoying!
BL.

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Not knowing what MBP model and previous OS you have it's difficult to say at this point exactly WHAT the issue is with your upgrade. I have heard the upgrades to Lion and Mtn Lion from anything previous can be problematic, depending on various things and/or how it is done. But usually, the older the MBP model and OS are (or any other Mac for that matter, assuming it CAN be upgraded of course), the more issues there can be.
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