Create Almost Any MacOS Installation Media [Developer Betas | Old Versions]
Things You Will need
- An existing MacOS Device or VM
- 30-40 GB of free disk space
Downloading MacOS Installers
- Download gibMacOS Download
- Extract the downloaded .zip file
- Double click the gibMacOS.command file > Click Open to confirm
- If prompted to install Python, type Y > Press Enter
- Use the keyboard and on screen instructions to navigate the menus and download the desired version of MacOS
Creating USB Installation Media
- Input a USB flash drive, 16GB or larger
- In Finder, navigate to the gibMacOS folder /
- Double click the InstallAssistant.pkg file to install it
- Follow the prompts of the installer to complete the setup
- Start LaunchPad from the dock
- Search disk utility > Click Disk Utility to launch it
- Select the USB flash drive on the left side
- Select Erase > Set the Name to MacOSUSB and the Format to ExFAT > Click Erase
- Start LaunchPad from the dock
- Search terminal > Click Terminal to launch it
- Run the following commands in terminal, altering the MacOS Installer name as needed
# write the installation files to USB flash media
sudo /Applications/Install\ macOS\ Ventura\ beta.app/Contents/Resources/createinstallmedia --volume /Volumes/MacOSUSB
- When prompted, enter your password
- Type Y and press Enter to confirm the action
Creating a Bootable .iso
- Start LaunchPad from the dock
- Search terminal > Click Terminal to launch it
- Run the following commands in terminal, altering the MacOS Installer name as needed
# create temporary disk image, make sure its larger than the downloaded installer
hdiutil create -o /tmp/macOS -size 13800m -volname macOS -layout SPUD -fs HFS+J
# mount the temporary disk image
hdiutil attach /tmp/macOS.dmg -noverify -mountpoint /Volumes/macOSISO
# use createinstallationmedia utility to copy files
sudo /Applications/Install\ macOS\ Ventura\ beta.app/Contents/Resources/createinstallmedia --volume /Volumes/macOSISO --nointeraction
# unmount the temporary disk image, alter the OS name as needed
hdiutil detach -force /Volumes/Install\ macOS\ Ventura\ beta
# convert the disk image to .iso
hdiutil convert /tmp/macOS.dmg -format UDTO -o ~/Desktop/macOS.cdr
# change the extension from .cdr to .iso
mv ~/Desktop/macOS.cdr ~/Desktop/macOS.iso