Why isn't OS X Mountain Lion not downloading from Mac App Store?

Hi all,
I have recently downloaded the OS upgrade to Mountain Lion from the Mac App Store for £13.99, and it is't downloading. Since purchasing I have received the bill from Apple outlining I have purchased the item. But nothing has happened as yet. I have looked under purchases in the Mac App Store and it just shows the progression bar...
79.3 MB of 4.37 GB - Calculating...
I have restarted my IMac many times and still nothing!!!
What can I do?? I have the icon for Mountain Lion in the dock but the only options available I can see are... Pause, or Cancel Download.
Please help!!!
I am running Mac OS X version 10.6.8
Thanks in advance

It looks stuck, and at this point, you probably ought to cancel the download and start it over again. (No worries about paying again... once you buy something in the App Store, you own it for as long as it stays in the store and can re-download it all you like.)
Also, before you consider installing the upgrade, note that there are some things you should do:
1) Check all your software for compatibility with the new system.
2) Repair the hard drive with Disk Utility.
3) Make a full backup of your whole system using Time Machine.
4) Ideally, make a second full backup of your whole system using something else, like Carbon Copy Cloner. (I consider two backups to be the minimum.)
5) Wait until you have time to deal with any possible problems that crop up.
6) Install the upgrade.
Some people recommend erasing your hard drive and installing the new system "cleanly." That certainly helps ensure that you don't have any problems with the new system, but is often unnecessary. I prefer to save clean installs for when they are actually necessary, but that is only an opinion. You can certainly choose to do a clean install if you prefer.

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Why isn't OS X Mountain Lion not downloading from Mac App Store?

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