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I am trying to install Snow Leopard 10.6.3 on a 2010 Mac Pro Quad Core Intel but on a secondary drive that is a solid state drive. My Mac Pro is only upgradable to El Capitan which I am running now on original hard drive. There are currently some glitches with installed system software on original drive and it's very slow to start up.

I spoke with Apple and they stated to start with Snow Leopard CD and upgrade to El Capitan online,

When I put Snow Leopard in I get a white circle with X thru install. Error comes up: You can't use this version of the application "Install Mac OS X" with thie version of OX. You have to "Install Mac OS X" 23.1.1

I'm tried rebooting from install disk, but it wouldn't boot. My MacBook Laptop does not have a CD drive so I can't do it by connecting that one. Urg!

Any help will be greatly appreciated! Liz

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    A 2010 Mac Pro Quad Core requires OS X 10.6.4. OS X 10.6.3 should not work. Your should be able to install a version newer than El Capitan. What is OS X 23.1.1? Have you tried creating an El Captain USB installer? How about High Sierra?
    – David Anderson
    Sep 28, 2020 at 6:20
  • Just download OS X El Capitan from Apple and create a USB Installer and then boot your Mac Pro with it and install OS X El Capitan on the second drive.
    – user3439894
    Sep 28, 2020 at 15:10
  • Apple Tech support instructed that I needed to install Snow Leopard first, then upgrade to El Capitan.
    – LIz
    Sep 29, 2020 at 2:21
  • 10.6.4 was not released til Mid June. I purchased my Mac end of May
    – LIz
    Sep 29, 2020 at 2:24
  • RE: "Apple Tech support instructed that I needed to install Snow Leopard first, then upgrade to El Capitan." -- If you are going to listen to Apple Tech Support then why did you post a question here!? What I said is absolutely doable and there is no need to first install MacOS X Snow Leopard to then upgrade it! Creating a USB Installer of OS X El Capitan bypasses that needless step. That is, if you will listen to someone that just happens to know more than Apple Tech Support in this particular instance!
    – user3439894
    Sep 29, 2020 at 9:57

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