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Groups > comp.sys.mac.system > #117262

Re: Downgrading the OS

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On 2018-06-09, Charles H. Sampson <csampson@inetworld.net> wrote:
>
> I have an unusual problem that requires me to have a computer running on
> 10.8. I bought the system disk from Apple for $20 but I'm unable to
> "downgrade". When I click on the disk's Install Mac OS X (which has the
> "No" symbol superimposed on it), I get the following messages:

If you have physical install media, it's a Mac OS X 10.6 (Snow Leopard)
DVD.

What *model* and *year* computer is this? Depending on the model, it may
or may not be able to run 10.6.

Knowing the model we'll know which version of macOS it came with and
which versions it can run.

What version macOS is *currently* running on it?

> "You can't use this version of the application 'Install Mac OS X' with
> this version of macOS. You have 'Install Mac OS X' 23.1.1."
> 
> What to do? Are there some system files that I should delete?

That's definitely not the verbatim message. You made some obvious typos
above.

Regardless, to install 10.6 on it, you'll need to insert the Install Mac
OS X 10.6 DVD into the drive, then reboot while holding the C key on the
keyboard to boot from the DVD. Once you've booted up, you'll need to run
Disk Utility from the Utilities menu, erase the startup drive, then quit
Disk Utility to get back to the installer, where you can then install
10.6 onto the startup drive.

Once you have 10.6 installed, you'll have to either use the App Store to
upgrade the OS or use a previously downloaded installer from the App
Store. I have every release archived so I can easily just copy a file to
upgrade when needed.

> By the way, I do have an up-to-date Time Machine backup for the computer
> whose OS I want to change.

Good, because installing 10.6 on it will naturally delete all data you
currently have on the drive. I would advise making another separate
backup with Carbon Copy Cloner or Super Duper as an added precaution.
Better safe than sorry.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

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Thread

Downgrading the OS csampson@inetworld.net (Charles H. Sampson) - 2018-06-09 13:24 -0700
  Re: Downgrading the OS ANTant@zimage.com (Ant) - 2018-06-09 15:41 -0500
  Re: Downgrading the OS nospam <nospam@nospam.invalid> - 2018-06-09 16:47 -0400
    Re: Downgrading the OS "John Varela" <newlamps@verizon.net> - 2018-06-10 18:56 +0000
    Re: Downgrading the OS csampson@inetworld.net (Charles H. Sampson) - 2018-06-11 13:46 -0700
  Re: Downgrading the OS JF Mezei <jfmezei.spamnot@vaxination.ca> - 2018-06-09 17:28 -0400
    Re: Downgrading the OS Your Name <YourName@YourISP.com> - 2018-06-10 10:40 +1200
  Re: Downgrading the OS Király <ggrandish@gmail.com> - 2018-06-11 15:04 -0700
    Re: Downgrading the OS nospam <nospam@nospam.invalid> - 2018-06-11 18:07 -0400
      Re: Downgrading the OS Steve Carroll <frelwizzen@gmail.com> - 2018-06-12 07:48 -0700
      Re: Downgrading the OS csampson@inetworld.net (Charles H. Sampson) - 2018-06-17 05:03 -0700
        Re: Downgrading the OS nospam <nospam@nospam.invalid> - 2018-06-17 11:26 -0400
          Re: Downgrading the OS Jolly Roger <jollyroger@pobox.com> - 2018-06-17 16:07 +0000
        Re: Downgrading the OS Jolly Roger <jollyroger@pobox.com> - 2018-06-17 15:44 +0000
          Re: Downgrading the OS Jolly Roger <jollyroger@pobox.com> - 2018-06-17 16:08 +0000
        Re: Downgrading the OS Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-06-17 17:27 +0000
          Re: Downgrading the OS dempson@actrix.gen.nz (David Empson) - 2018-06-18 12:12 +1200
            Re: Downgrading the OS ANTant@zimage.com (Ant) - 2018-06-17 19:43 -0500
              Re: Downgrading the OS nospam <nospam@nospam.invalid> - 2018-06-17 20:57 -0400
              Re: Downgrading the OS Leonard Blaisdell <leoblaisdell@sbcglobal.net> - 2018-06-18 17:36 -0700
              Re: Downgrading the OS Steve Carroll <frelwizzen@gmail.com> - 2018-06-18 18:42 -0700
        Re: Downgrading the OS JF Mezei <jfmezei.spamnot@vaxination.ca> - 2018-06-17 15:11 -0400
    Re: Downgrading the OS Steve Carroll <frelwizzen@gmail.com> - 2018-06-11 22:44 -0700
    Re: Downgrading the OS Steve Carroll <frelwizzen@gmail.com> - 2018-06-12 01:51 -0700
  Re: Downgrading the OS Jolly Roger <jollyroger@pobox.com> - 2018-06-17 15:41 +0000

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