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Click the Install button. A sheet asks for your Apple ID and password. Type them in the appropriate fields; click Sign In, and your Mountain Lion installation (or reinstallation) begins. The operating system takes 30 to 60 minutes to install, so now might be a good time to take a coffee break. This video and article will show you a step by step guide on how to upgrade OS X Mountain Lion to Mavericks.

OS X version 10.8, called 'Mountain Lion,' was released in July 2012. Update 10.8.5 was released in September, 2013, and 10.8.5 Supplemental Update was released at the end of September 2013. More information on Mountain Lion is in John Siracusa's Ars Technica review. This note describes how to update a computer with an older version of MacOS to OS X 10.8 Mountain Lion.

The latest version of macOS is version 11.0.1, 'Big Sur', released on 12 Nov 2020.

Features of Mountain Lion

While I was researching an OS X Tips column for later this week, I came across a.sit file. Now, if you've been working with Macs as long as I have (my. Mountain Lion OS X Update 10.8.31. Mountain Lion OS X Update v10.8.3 is recommended for all OS X Mountain Lion users and includes features and fixes that improv.

Mountain Lion is 'inspired by iPad' and features better security, further iCloud and iPhone integration, and more game support. Apple claims '200+ new features.' Some of these features may not be useful to you, though; for example, I don't use any of the following:

Facebook and Twitter links are built in.
Messages sent to your iPhone number appear as Messages on your Mac.
FaceTime on your Mac receives calls sent to your iPhone number.
Shared reminders help you track to-dos with other people.
Dictation allows you to speak and have it translated to text.

Should I Buy and Install Mountain Lion?

You should probably update to a newer OS, in order to get security updates. Using an unsupported OS will still work, but if security problems are found in an unsupported version, Apple will not patch them.
Eventually, companies will write software that requires features of the latest Apple OS, and someday you may want to buy and use some of that software. Apple has released versions of iPhoto that will not work on earlier versions of the OS.
(01 Feb 2016) Google Chrome is no longer supported on OSX 10.8, and won't get any more updates.
If your current Macintosh fails and you have to buy a new one, you'll end up migrating to the latest OS whether you were ready or not.

Show Stoppers

All issues that were show stoppers for me have been resolved.

What you Should Do Now to Get Ready for Mountain Lion

Use Software Update to keep all Apple software up to date, including the OS.
Apply all free updates to other software you use.
Set up an external hard drive and use Time Machine.
Add more RAM if you can.
Fix damaged and duplicate fonts.
Use Disk Utility to repair permissions on your hard drive.
If you are running a version of Mac OS X earlier than Snow Leopard, you will have to install Snow Leopard first. You can buy an installer disc for Snow Leopard from Apple's web site for $20.

Who Can Update

Not everyone can use the new OS version.

If you have a Mac that can't boot and run with 64-bit addressing, Mountain Lion won't work on it. Mountain Lion also requires fairly recent video cards. See the list online at the Apple web site that specifies what Mac models can run Mountain Lion. If your computer does not meet these requirements, stick with OS X 10.6 (Snow Leopard) or 10.7 (Lion).
You need at least 2GB of memory, preferably more.
Mountain Lion is only sold through the Mac App Store, which only runs on OS X 10.6.7 or later.
If you depend on PowerPC programs, the latest version of OS X that you can run is Snow Leopard, since Mountain Lion does not support Rosetta, the PowerPC emulator. See the Frequently Asked Questions section about Mountain Lion. In particular, pre-Lion Quicken, Microsoft Office 2004, and some features of Adobe CS3 will not run on Mountain Lion. (See Adobe article.) Stick with OS X 10.6.8a until you upgrade these applications.
You could install VirtualBox (free) on your Mac, and install 10.6 into a virtual machine, and update it to 10.6.8a, and run your PowerPC programs under the emulated OS. I have not tried this. It sounds pretty inconvenient.
If you depend on the Classic environment to run Mac OS 9 programs from the 1990s, stick with OS X 10.4.
If you have a Mac with a PowerPC processor, Mountain Lion won't work on it. Stick with OS X 10.5.8.
You can't install Mountain Lion over an ancient version of OS X: Apple's license terms specify that Mountain Lion is only for Macs that have Lion or Snow Leopard installed, and the installer enforces this.
Old printers and scanners may not work if the manufacturer has not updated the driver software. Those with PowerPC or 32-bit drivers will not work.
The Apple USB Modem (discontinued in 2009) is not supported. Its drivers use 32-bit addressing and Mountain Lion is 64-bit.

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Plan your install

When you decide to install Mountain Lion, do it carefully. You may find that there are issues that affect you: do your homework. Check MacInTouch to see if there are problems with OS X 10.8 that affect you.

Make sure you back up your entire disk before starting to install Mountain Lion.

Make a list of the hardware you depend on, and search the web to check that each device will work. Older printers and scanners can have issues.

Leave yourself enough time. Upgrading will tie up your computer for a big part of a day. Installing takes an hour or two, but then your computer will want to re-do the Spotlight index and back up to Time Machine.

Finding PowerPC Programs

PowerPC-only programs on your computer will not run on Mountain Lion. To find these programs, select ► About This Mac and then click More Info to generate a system report. In the left sidebar of this report, click Software ► Applications. This generates a table of all applications on your computer. Click on the Kind column header to sort by kind of application. Scroll down till you find the programs labeled PowerPC. Many of these programs are not problems: they are leftovers from old software installers or previous versions of software. For example /Library/Application Support/Adobe/AdobePDF.app. If you have questions, contact the manufacturer.

Particular issues before upgrading

Here is a partial list of minimum program versions needed for Mountain Lion. For other programs, check product websites.

Program	Minimum Version	Notes
Microsoft Office	2008	2011 Home version is about $110
Parallels	6.0	$50 upgrade
VirtualBox	4.24	free
Quicken	2007 'Lion Compatible' version	$15 upgrade
Adobe Photoshop	CS5	see Adobe site
Adobe Illustrator	CS5	see Adobe site
Suitcase Fusion	4.0	$50 upgrade
Little Snitch	3.0.2	$17 upgrade
Fink	0.34.4	free
MacPorts	2.1.2	free
Apple XCode	4.4	free
DropBox	1.6.13	free

Programs that will not be upgraded: Some device drivers: check with the device manufacturers. The free software CUPS drivers may work for some printers.
Programs that may cause problems with Mountain Lion on some MacBook Pro models: AirDisplay, iScreen.
Features of previous releases no longer supported by Apple: Front Row (search for XBMC); Time Machine to shared drive on Airport Extreme

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