Apple Releases OS X Mountain Lion Developer Preview 4

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Apr 12, 2001
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Apple released new versions of OS X Mountain Lion to developers today. Developer Preview 4 arrives with a build number of 12A239, while OS X Server Developer Preview 5 has build number 12S254j.

The release notes do not reveal any major updates to the software, but note a few minor issues with Setup Assistant, FileVault and QuickTime screen recording. Most significantly, the release does not ask developers to focus on any specific areas for testing, suggesting Mountain Lion will indeed be ready for release next month.

Mountain Lion was covered extensively at the WWDC Keynote this morning. It will be released in July on the Mac App Store for $19.99.

Article Link: Apple Releases OS X Mountain Lion Developer Preview 4
 

GIZBUG

macrumors 68020
Oct 28, 2006
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Can this be installed OVER Lion as an upgrade? Or do you have to format/clean install this?

Also, for those who ran previous previews, can you update to this one, or again, fresh install?
 
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RoelJuun

macrumors 6502
Aug 31, 2010
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I just don't want Apple to rush Mountain Lion, fix all the bugs first and release it when it's ready. And write some great drivers for the older models too please, don't focus only on your newest creations.
 
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mattburley7

macrumors 68040
Oct 13, 2011
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im assuming we will see a GM build next than the final? as for Facebook integration.. maybe 10.8.1?
 
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calsci

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Nov 27, 2008
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I have the same question. Will this show up in the app store for developers? Its not that hard to go to the website but it is easier to use the app stores upgrading mechanism.
 
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Naaaaak

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Mar 26, 2010
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I just don't want Apple to rush Mountain Lion, fix all the bugs first and release it when it's ready.
Users are the new beta testers. With yearly releases, I think they just assume if you want fixes you'll just upgrade to whatever new OS version they have and get some new features, as well.

To me, Lion already doesn't feel nearly as stable as Snow Leopard did, and I expect that feeling to continue into Mountain Lion.

And write some great drivers for the older models too please, don't focus only on your newest creations.
This is Apple. Abandoning older models is their MO. I don't expect them to support any special features in hardware older than a year or two. Remember their requirements for Core Image at the time of its reveal? Or the speedups to FileVault in 10.7 only possible with newer hardware? Maybe they could make things work with older hardware, but it's a waste of their development time and does not help them sell new hardware.
 
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yetanotherdave

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Apr 27, 2007
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Anyone else confused by the bit where it says you "can't upgrade from this to the final build" :S I don't have any spare partitions right now, so I guess I'm not playing :(
 
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yetanotherdave

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Apr 27, 2007
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Where does it say that?
from 9to5mac the release notes

OS X Mountain Lion Developer Preview 4 Seed Note

OS X Mountain Lion Developer Preview 4 is prerelease software. Do not use this prerelease software in a commercial operating environment or with important data. You should back up all of your data before installing this software and regularly back up data while using the software. You will not be able to upgrade from the OS X Mountain Lion Developer Preview to the final release.

If an installation of OS X Developer Preview 4 fails, try using Disk Utility from a Recovery HD to repair the disk.
http://9to5mac.com/2012/06/11/apple-seeds-os-x-mountain-lion-developer-preview-4
 
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