install os
Download
https://support.apple.com/en-us/HT211683
Create a bootable installer for macOS
Plug in the USB flash drive or other volume that you're using for the bootable installer.
Open Terminal
Type or paste one of the commands below into Terminal, then press Return to enter the command.
Each command assumes that the installer is in your Applications folder,
and MyVolume is the name of the USB flash drive or other volume you're using.
If the volume has a different name, replace MyVolume in the command with the name of your volume.
When prompted, type your administrator password.
Terminal doesn't show any characters as you type. Then press Return.
When prompted, type Y to confirm that you want to erase the volume, then press Return.
Terminal shows the progress as the volume is erased.
After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume.
Click OK to allow the copy to proceed.
When Terminal says that it's done, the volume will have the same name as the installer you downloaded,
such as Install macOS Ventura. You can now quit Terminal and eject the volume.
sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
Use the bootable installer - Apple silicon
Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
A bootable installer doesn't download macOS from the internet,
but it does require an internet connection to get firmware and other information specific to the Mac model.
Turn on the Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
Select the volume containing the bootable installer, then click Continue.
When the macOS installer opens, follow the onscreen installation instructions.
