Mac OS X Mountain Lion (version 10.8) is the nineth major release of Mac OS X (now named macOS), Apple’s desktop and server operating system for Macintosh computers. OS X Mountain Lion brings a lot of great things from iPhone, iPad, and iPod touch to the Mac. You can send iMessages. Get your Mac in on Game Center. Receive notifications. Saturday at 3:40 PM; AudioGod; 10.14 Mojave New. Threads 31 Messages 120. 31 Threads 120 Messages. System won't boot up. Feb 24, 2021; Black9dev; 10. Download Mac OS X Yosemite - The OS X Yosemite 10.10.5 update improves the stability, compatibility, and security of your Mac, and is recommended for all users.

I managed to install Mac OS X 10.5.8 on an AMD Athlon X2 system after little trouble. I’ll post the procedure to make sure if I have to do it again I can easily refer and someone trying to do the same can save the trouble. This will be composed of a series of posts, a post per step.

In the mean time find out the specifications of your box. I’m using GIGABYTE GAPM61SME-S2 motherboard with AMD Athlon X2 CPU. If your specifications are just like mine go ahead and download all the files listed bellow, otherwise download 1-3 and then look for kexts for your motherboard.

System specification

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AMD Athlon X2 2800
nVidia GeForce 6100/nForce 405 chipset
1 x 2 GB of DDR2 DIMM
On board ethernet (nForce 10/1oo Mbit)
Realtek ALC883 CODEC chip
SATA HDD (nForce sata controller)
USB Mouse
USB Keyboard
DVD Drive

Downloads

iPC OSx86 Leopard 10.5.6 Intel AMD SSE2 SSE3 DVD (Google and find out, you will have to download via Bit torrent)
Mac OS X 10.5.7 Update (http://keti.ws/95282)
Mac OS X 10.5.8 Combo Update (http://keti.ws/95283)
nForceLAN (http://keti.ws/94281)
AppleNForceATA (http://keti.ws/95281)

Steps

Patch the iPC DVD image (Otherwise the DVD will never boot)
Install Mac OS X 10.5.6
Remove all Intel kexts (Improves the boot time)
Install Mac OS X 10.5.7 update
Install Mac OS X 10.5.8 update

Await step 1, Patching the iPC DVD image tomorrow.

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To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.

Learn how to upgrade to macOS Big Sur, the latest version of macOS.

Check compatibility

If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation.

To confirm compatibility before downloading, check the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan, or Yosemite. You can also find compatibility information on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro.

Make a backup

Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Download macOS

It takes time to download and install macOS, so make sure that you're plugged into AC power and have a reliable internet connection.

Mac Os X Amd Download Windows 10

Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.

macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion

Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.

Mac Os X Amd Downloader

macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard

Install macOS

Mac Os X Update

Follow the onscreen instructions in the installer. It might be easiest to begin installation in the evening so that it can complete overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

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Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs macOS and related firmware updates.

Learn more

You might also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.