Won't this accomplish the same thing?
(How do I attach a pdf file to this message, so the formatting doesn't get lost....??)
How to create a bootable installer for macOS
You can use an external drive or secondary partition as a startup disk from which to install the Mac operating system.
A bootable installer can be useful when you want to install macOS on multiple computers without downloading the installer each time. When your Mac starts up from a bootable installer, it starts up directly to the macOS installer, and doesn't require an Internet connection to complete the installation.
Download macOS from the App Store
1. DownloadmacOSfromtheAppStore.Todownload,useaMacthatiscompatiblewiththeversionof macOS you're downloading.
If you're downloading macOS High Sierra, use a Mac with High Sierra, Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators: Please download from Apple, not a locally hosted software-update server.
2. WhenthemacOSinstalleropens,quititwithoutcontinuinginstallation.
3. FindtheinstallerinyourApplicationsfolderasasingle”Install”file,suchasInstallmacOSHighSierra.
Use the 'createinstallmedia' command in Terminal
1. Afterdownloadingtheinstaller,connectyourMactotheUSBflashdriveorothervolumethatwillbe used as the bootable installer. Make sure that it has at least 12GB of available storage.
2. OpenTerminal,whichisintheUtilitiesfolderofyourApplicationsfolder.
3. TypeorpasteoneofthefollowingcommandsinTerminal.Theseassumethattheinstallerisstillinyour Applications folder, and the name of your volume is MyVolume. If it's named differently,
replace MyVolume accordingly.
High Sierra:
Sierra:
edia --volum
-volume /Vol
These advanced steps are primarily for system administrators and others who are familiar with the command line. It isn't necessary to create a bootable installer to install macOS.
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallm
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -
El Capitan:
dia --volume
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallme
e
u
Yosemite:
sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia
--volume /V
Mavericks:
4. PressReturnaftertypingthecommand.
5. Whenprompted,typeyouradministratorpasswordandpressReturnagain.Terminaldoesn'tshowany characters as you type your password.
6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
7. QuitTerminalwhendone.ThebootableinstallerisnowreadytouseonacompatibleMac.Learnhowto choose it as your startup disk.
Use the bootable installer
1. ConnectthevolumecontainingthebootableinstallertoacompatibleMac.
2. UseStartupDiskpreferencesorStartupManagertoselectthatvolumeasthestartupdisk.Learn
about selecting a startup disk, including what to do if your Mac doesn't start up from it.
3. YourMacthenstartsupdirectlytothemacOSinstaller.Followtheonscreeninstructionstoinstall
macOS.