
Optionally partition it by selecting it and using the Partition tab to split it into two logical volumes (one for the Mountain Lion installer and the other for extra storage space) by clicking the plus button to create a new partition, and then setting the first partition to be 4.8GB in size.Do you need to download a full macOS installer? I will show you 7 different ways! How to download macOS Sonoma 14,Ventura 13 Monterey 12, Big Sur 11, Catalina 10.15, Mojave 10.14, High Sierra 10.13, Sierra 10.12, 10.11 El Capitan, 10.10 Yosemite, 10.9 Mavericks, 10.8 Mountain Lion & 10.7 Lion Connect a spare USB or FireWire drive that has at least 6GB of capacity, which should show up in Disk Utility.If you wish to create a USB or FireWire install drive instead, then continue on to step 6.



Locate and right-click the Mountain Lion installer to show its contents (click for larger view).
