Below is a guide for the most likely interpretations of your request. 1. Downloading macOS 12 (Monterey)
Click to open System Preferences and begin the download. Via Terminal (Advanced) : Open Terminal from Applications > Utilities.
To download the specific 2022 version (e.g., 12.6), type: softwareupdate --fetch-full-installer --full-installer-version 12.6 .