Leopard --> Mountain Lion

Discussion of issues related to OSX 10.9 (Mavericks) and all earlier versions of OS X.
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Stephen Hart
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Leopard --> Mountain Lion

Post by Stephen Hart » Tue Sep 11, 2012 4:34 pm

I was surprised to find the my wife's college mini still has Leopard. I'd forgotten that there's no obvious path from Leopard direct to Mountain Lion.

Has anyone in SMUG faced this and conquered it?

In research, I found this article:

http://www.macworld.com/article/1161087 ... opard.html

I think I'll use the sneaky method of altering the system version plist entry, then installing with Target mode from another Mac running Mountain Lion (copying the installer to the desktop). Anyone done that?

Alternatively, I could try to dig up a Snow Leopard install disk and update the Leopard mini first. Anyone have Snow Leopard on disk?

By the way, we have bought a copy of Mountain Lion for her two college Macs, and will get reimbursed by the college. It's all legit.
"Design is not just what it looks like and feels like. Design is how it works."
Steve Jobs

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Stephen Hart
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Re: Leopard --> Mountain Lion

Post by Stephen Hart » Wed Sep 12, 2012 3:45 pm

I decided to use Macworld's article to build a Mountain Lion bootable install drive. I'll report back after trying that out, along with the property list trick I mentioned above.

http://www.macworld.com/article/1167857 ... drive.html
"Design is not just what it looks like and feels like. Design is how it works."
Steve Jobs

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Stephen Hart
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Re: Leopard --> Mountain Lion

Post by Stephen Hart » Thu Sep 13, 2012 3:02 pm

Conclusion:
This method works perfectly.
To review:

1. I modified the system version property list on the Mac mini, using the instructions in this article:
http://www.macworld.com/article/1161087 ... opard.html
Note that you don't need TextWrangler* for this. I option dragged the property list to the desktop, and opened and edited it in TextEdit. Then I dragged the original property list to the trash, dragged the edited version to the proper folder and restarted. The change stuck after a restart.
* TextWrangler can edit live system files and get authorization to save them in place. That would save a couple of steps. But unfortunately, the current version of TextWrangler won't run on Leopard.

2. I built a bootable Mountain Lion install drive using the instructions in this article:
http://www.macworld.com/article/1167857 ... drive.html
I built this at home and tested it to make sure it was bootable. I used an 80 GB portable, bus-powered drive that had FireWire. You can use a USB drive or flash-memory drive, but it'd likely be quite slow.

3. I started the Mac mini from my bootable Mountain Lion install drive and proceeded to install on the mini.

4. There is no step 4. The above procedure just worked.

Oh, and the reason for this upgrade: to keep using Calendar.app syncing by way of iCloud. The calendar populated with what we already had in iCloud automatically, and we tested adding an item. Notes also works.
"Design is not just what it looks like and feels like. Design is how it works."
Steve Jobs

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