I recently purchased an old Mac Pro, from eBay to use it as an advanced CPU performance computer as opposed to my 2012 MacBook Air that can't endure much. So far it is working, I have gotten a wireless dongle to connect, and I thought all was good until I went to my App Store to upgrade to El Capitan. When I click "Get" on it's page. I get this error:
We could not complete your purchase. This version of OS X 10.11 cannot be installed on this computer.
I checked the Apple Upgrade page and it is all good. A quick look at the forms, still all good. Even a Google search on other locations on the internet did not help me. So, I have decided to present your ever so luxurious minds with my preposterous issue. I was wondering if any of you knew how to get my Macintosh to update. Is there some stupid mistake I am missing, is it seemingly unfixable? If you need my computer specifications, here they are:
Processor: 2 x 2.66 GHz Dual-Core Intel Xeon
Memory: 4 GB 667 MHz DDR2 FB-DIMM
Graphics: NVIDIA GeForce 7300 GT 256 MB
Software: Mac OS X Lion 10.7.5 (11G63)
Thank you for your efforts in advance.