macOS Ventura 13.0.1 InstallAssistant.pkg.The following links point to locations from Apple website where you can download various MacOS system software installers. This article will discuss where to download and access installers for macOS Ventura 13, MacOS Monterey 12, macOS Big Sur 11, macOS Catalina, MacOS Mojave, MacOS High Sierra, macOS Sierra, Mac OS X El Capitan, OS X Yosemite, OS X Mavericks, Mac OS X Mountain Lion, Mac OS X Lion, Mac OS X Snow Leopard, Mac OS X Leopard, Mac OS X Tiger, and others too. Click on Continue, select the destination drive, and install.Downloading and using different Mac OS installers is very common for troubleshooting purposes, for IT staff and admins, and for tinkerers. Select the orange “Mac OS X” option and you will boot into the OS X Mountain Lion installer, from here installation is the same as normal.

When finished, reboot the Mac and hold down the Option key to bring up the boot menu: Confirm that the USB drive will lose it’s data and enter the Admin password when askedĭisk Utility will now create a bootable OS X Mountain Lion installer drive out of USB drive using the disk image, this can take a little while depending on how fast the drive and Mac are but 20-30 minutes isn’t unusual.Drag the formatted partition to the “Destination” section, then click on “Restore”.Drag the previously mounted “Mac OS X Install ESD” image into the “Source” section.Now select the formatted USB drive from the left side and click on the “Restore” tab.Select the USB drive from the left menu and click on “Erase” tab, choose “Mac OS X Extended (Journaled)” as the format, then click on the “Erase” button in the corner.Launch Disk utility and connect a USB drive to the Mac.Make the OS X Mountain Lion Install Drive Double-click on InstallESD.dmg to mount it on the desktop.Open the “Contents” directory and then open “SharedSupport”, looking for a file named “InstallESD.dmg”.

Go to the /Applications/ directory and right-click on “Install Mac OS X Mountain Lion.app” selecting “Show Package Contents”.

Download OS X 10.8 Mountain Lion from the App Store.

Download OS X Mountain Lion and Extract the DMG File If you already have the Mac OS X Mountain Lion install DMG extracted, skip this first set of steps and jump directly to making the bootable drive below. We’ll walk through the process here, but don’t forget to check OS X 10.8 system requirements for the destination Mac before beginning. By creating a bootable install drive, you can perform clean OS X 10.8 installs, install it on separate partitions, and install OS X Mountain Lion on Macs that don’t have internet connections.

Mac os x mountain lion 10.8 iso