Why can't I update to Mavericks from 10.6.8 on a Mac Pro Desktop Early 2008. It meets all requirements listed by Apple.

Why can't I update to Mavericks from 10.6.8 on a Mac Pro Desktop Early 2008. It meets all requirements listed by Apple.

I'm having the same issue with same error message "OS X Mavericks cannot be installed on this computer". I click the "INSTALL" button in the app store and I get the message. 
I have a macbook pro 15 inch, 60 GB of free space, 2.33 GHz Intel Core 2 Duo, 3 GB of Ram (well really 4 but it can't see the 1 extra gig). Mac OS X version 10.7.5.   I read the install description and I meet the requirement.
I have checked Launchpad for a stalled install (all 3 pages) and have checked if I have a time machine backup file on my root directory. No, I don't.

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