This is how to perform a clean installation of macOS 12 Monterey.
Download CleanMyMac X free edition here: [ Ссылка ]

Step 1: System backup & cleanup

Clear out system junk
Backup your Mac using Time Machine

Step 2: Downloading macOS Monterey

You can download the installer from the Mac App Store by this link:
[ Ссылка ]

Step 3: Create a bootable USB installer

The command line for Terminal (for Monterey Beta):

sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled

Step 4: Erase your Mac and boot macOS from USB

Go to Recovery mode
Run Startup Security Utility to change security settings.
Boot from macOS Monterey USB installer
Erase your Mac in Disk Utility
Install macOS Monterey

The app I mention in this video: CleanMyMac X by MacPaw:
[ Ссылка ]

The detailed guide to installing macOS Monterey:
[ Ссылка ]


Content:
00:00 - Intro
00:31 - What is a clean installation
00:59 - Back up and clean up the system
02:02 - Prepare the backup
02:35 - Download macOS Monterey
03:56 - Create the bootable installer
05:39 - Erase your macOS and install the new one
07:05 - Outro

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