OSX Mountain Lion says not compatible when it is. Advice please.

Hi.
i am running OSX Lion 10.7.5 and waht to upgrade to mountain lion.
i purchased this on my macbook via the app store and it downloaded no problem but when i go to download it on my mac pro tower its says the following....
"We could not complete your purchase. OS X Mountain Lion is not compatible with this computer."
my house mate installed it on his mac pro and his is an older version than mine, i think mine is a 2009 model.
Model Name:          Mac Pro
  Model Identifier:          MacPro1,1
  Processor Name:          Dual-Core Intel Xeon
  Processor Speed:          2.66 GHz
  Number of Processors:          2
  Total Number of Cores:          4
  L2 Cache (per Processor):          4 MB
  Memory:          5 GB
  Bus Speed:          1.33 GHz
so i am looking for advice on how to fix this so i can upgrade to mountain lion....
i hope some one can help soon
Dan.

boomboom1980 wrote:
i produce music so like to upgrade all the time as eventually people stop upgrading the drivers....
i think mine is a 2009 model.
Model Name:          Mac Pro
  Model Identifier:          MacPro1,1
  Processor Name:          Dual-Core Intel Xeon
  Processor Speed:          2.66 GHz
  Number of Processors:          2
  Total Number of Cores:          4
  L2 Cache (per Processor):          4 MB
  Memory:          5 GB
  Bus Speed:          1.33 GHz
MacPro 1.1 is a 2006 Model

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