When I start the RS, it asks to update. After it downloaded the update, when it tried to install it, it gives an error “You cant install Macintosh HD disk, it is ready only”.
I searched and it seems like Apple changed the structure and they split system files and user files as also disk. The update trying to install in old style, and apple doesn’t allow it anymore. It should install to “Macintosh HD - Data” disk.