Completely fix macOS 10.15 Catalina update error: An error occurred while installing the selected updates

Completely fix macOS 10.15 Catalina update error: An error occurred while installing the selected updates
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MacOS Catalina 10.15 has been released. However, many users have faced installation failed with the following error: An error occurred while installing the selected updates .

How to fix?
It’s so simple to get rid of the trouble by doing the installing under the Safe Mode.

How to boot your Mac into Safe Mode?