HT1338 I've just tried to download Mountain Lion on my Mac Pro and it says that I can't install it on this computer. Help

I just tried to download Mountain Lion on my Mac Pro and it says that I can't install it on this computer.
I have version 10.7.4 installed and I'm using Lion at the moment.
Could you advise me as to how I obtain Mountian Lion on this computer.
Thank you

Check the complete list of supported machines here:
http://applehelpwriter.wordpress.com/2012/08/03/will-mountain-lion-work-on-my-ol d-mac/
(ToU Disclaimer: this link to my site contains other links which promote my services as a technical writer)

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