Shortly after Apple releases an OS update, Reed Macs will see the prompt below to install the update. If now is not a good time to restart and install the update, click the "Defer" button. Up to 5 deferrals are allowed.

Three days later, you will be prompted again. When you are ready to install the update, click "Restart". When the maximum number of deferrals is reached, you are prompted to restart immediately. Newer Macs with Apple Silicon will be prompted to type in the computer password of the current user.

Save your files before entering your password and clicking "Restart".

The computer will restart within a minute and then install the update. Your computer will never restart without you clicking the Restart button.