Most users do not experience issues when upgrading to a new operating system, but a small minority does. Next, let's open up a Terminal window and extract the package to a folder on our desktop. Apple has announced this morning a developer preview of its next release of its operation system, OS X Mountain Lion. This interactive book will guide you on the journey to Mountain Lion, with the help of video tutorials. To start, grab the InstallMacOSX/InstallOS.dmg and mount it: Items discovered while testing: If the ShoreTel Communicator for MAC App was already installed prior to upgrading to OS X Mountain Lion 10.8 (From OS X Lion). This means we'll need to manually extract the installer. Your SMBIOS is too new to run that version natively (even if you're trying to make a USB for a different computer, it still checks). pkg inside.ĭepending on what OS you're on, you can install this package, which will provide you with a 'Install (macOS version).app' and head to Setting up the installer however if you receive this error: A bootable ISO or bootable USB can be made directly from the InstallESD.dmg disk image found under Contents/SharedSupport/. Un-archive the zip archive and you will get the app Installer. Both versions 10.8.4 AND 10.8.5 full installers included (zipped).

How to get old versions of macOS (opens new window) (for 10.10 - 10.12 installers)ĭownload your desired version and a. Official OS X Mountain Lion.app Installer from the Mac App Store.

If youre Mac OS X user, you may have already.

Mac OS X Mountain Lion Installer (opens new window) Note: This Article Only Applies For OSX Version 10.8 And Above I.E Mountain Lion (10.8), Mavericks (10.9).

With the new Messages app, you can send text, photos, videos, contacts, Web links, and documents to anyone using another Mac, iPhone, iPad, or iPod touch - you can even start a conversation on one device and continue it on another.

Mac OS X Lion Installer (opens new window) Mountain Lion includes over 200 new features to update your Mac into the best computing experience yet.

To start, go to one of the following links: Download OS X Mountain Lion Update v10.8.5 (Combo). Mac OS X 10.8 Mountain Lion is available for older systems that are not compatible with the latest version of macOS and. See Legacy macOS: Online Method for this version.

Mavericks (10.9) is not available with this method. Getting started with ACPI (opens new window).

Os x mountain lion app