When you download OS X El Capitan using the Mac App Store, a raw package (.pkg) file is downloaded from the Apple server. This raw file is not installable on its own. While downloading the package, MAS processes and converts it into an executable (.app) file, which can then be installed on your Mac. The Apple ID is just to verify you have El Cap. It does not sync your Apple ID to the OS. Once the OS is installed it’ll go through the standard user account setup on a brand new machine. It’s when you create the user account that you have the sync option. At this point you can just turn off the laptop by holding the power button.
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