I went to the Apple Store and tried to purchase OS X Mountain Lion and when I click Buy App I get a message "OS X Mountain Lion is not compatible with this computer." There is no other explanation or information.
Anyone else have this or does anyone know why?
Jim
Mac Pro, Mac OS X (10.7.5)
Mac Pro models before the 2008 models have an EFI-32 firmware version so old, Apple has decided not to update it to EFI-64. (there may not be enough space in the control store to update it easily.)
The newer Mac OS X 10.8 version also requires a newer graphics card and MUCH more RAM memory, which is frighteningly expensive on these older models.
If you need a major RAM upgrade, you could sell your old Mac and buy a 2009 or later model, add more RAM, and still come out ahead.
Why can't I upgrade my Mac Pro to Mountain Lion?
