At here, we are using Install Disk Creator, one of the best GUI programs to make a bootable USB from macOS. So you must use third-party apps to get it done. The bootable information should be written to USB at the same time. When you get the macOS 10.15 Catalina install file, the next move is to burn the file to USB. However, if you downlaoded the Catalina install app from App store, please skip this part and read the following recommendations.ĭownload Mac Version Part 4: Create Bootable macOS Catalina USB Using Install Disk Creator If you have download macOS Catalina DMG file, then UUByte DMG Editor is the only tool you can find to make a macOS bootable USB from DMG disk image. Part 3: Create Bootable macOS Catalina USB Using DMG Editor You will find the an app named Install macOS Catalina in Application folder. Step 3: Confirm the operation and the system starts to download macOS Catalina Installer. Now the Software Update interface shows up, asking if you want to download macOS Catalina. Step 2: The macOS Catalina install app appears in search result and click 'Get' button.

Step 1: Open App Store on Mac and type 'Catalina' in search bar. This happens a lot at least on my MacBook Pro. The most common way is via Mac App Store or you can use the third-party apps, which is a good alternative if the operation could not completed successful in App store. There are two ways to download macOS Catalina 10.15. Part 2: Download a Copy of Bootable macOS Catalina Installer Make sure there are enough free space on Mac. An USB drive with a minimum storage capacity of 16 GB. An accessible Mac computer where you can download and make the bootable installation drive.Ģ. This will avaoid the portential issue within the installation process.ġ. Part 1: Preparation for Making a Bootable macOS Catalina Install USBīefore we get started for creating bootable macOS Catalina install USB, there are a few things we should pay attention to. Looking for make a bootable USB installer for macOS Catalina for your Mac device but don't know how? Well, this article will guide you straight away with all the preparatory tips and steps to create a bootable macOS Catalina USB install drive in minutes. So before the Mac goes into trouble or just want to install a fresh copy of Catalina, it is highly recommend making a bootable USB installer right now! It means only macOS Catalina is available for future macOS install.

And it is the right time to create a bootable USB install USB based on Catalina becasue the signing certificates for old version of macOS and OS X are expired soon. MacOS 10.15, code name for Catalina, is the latest operating system shipped for Mac desktop and laptops.

Create bootable usb on mac