Ap store says "we could not complete your purchase.  OS X Mountain Lion is not compatible with this computer".  I'm running 10.6.8 duel core intel with 15gb of  memory.  Any ideas on why  I can't download?

Ap store says "we could not complete your purchase.  OS X Mountain Lion is not compatible with this computer".  I'm running 10.6.8 duel core intel with 15gb of  memory.  Any ideas on why  I can't download?
Thanks.

If the OP has this much RAM in their iMac, certain this Mac can run Mountain Lion.
The reason it might not be installing is that 15 GBs of RAM.
Your iMac should have (4) equal sized, 4 GB sticks of RAM for a total of 16 GBs.l
If your iMac is only reporting that there is only 15 GBs of RAM, you have a RAM stick that is either not seated in its slot properly or is defective/going bad.
This maybe the reason that it won't download it.
Also could be you are running out of free space on your HD.
You need, at least 15-20 % or greater free space left on your HD.

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