sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction This takes 10-15 minutes. This is the critical step where Apple’s tool builds the bootable recovery system inside your DMG.
mv ~/Desktop/macOS_Catalina_10.15.7.iso.cdr ~/Desktop/macOS_Catalina_10.15.7.iso macos catalina 10157 iso download new
diskutil eraseVolume JHFS+ Catalina /Volumes/Catalina sudo /Applications/Install\ macOS\ Catalina
Run this in Terminal:
If you are searching for the keyword , you are likely one of three types of users: a developer needing a cross-platform virtual machine (VM) image, a vintage Mac user trying to revive older software, or an IT professional building deployment media. Whatever your reason, you have landed on the right guide. Whatever your reason, you have landed on the right guide
hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J This makes an 8.5 GB empty hard disk image.
softwareupdate --fetch-full-installer --full-installer-version 10.15.7 This command forces Apple’s catalog server to send you the complete 8.2 GB installer. Once finished, you will find Install macOS Catalina.app in your /Applications folder. For advanced users who want to verify checksums and download the exact build 19H15 (the final build of 10.15.7), use the open-source tool gibMacOS :