This is how I do it with the older MacOS versions [http://www.theinstructional.com/guides/how-to-re-run-the-os-x-setup-assistant|How to Re-Run the OS X Setup Assistant]. I haven’t tried it under Mojave yet, but I don’t think Apple has altered things.
Do keep in mind the only reason you would need to remove the empty ''.AppleSetupDone'' file is so the system thinks this is the first time setup was run.
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=== Update (11/05/2018) ===
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The first user account is by default the Admin account. But you can always create a new user account which has admin privileges. Or make guest or limited user accounts.
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You can’t run a system without a admin account so deleting it is not wise. You can alter the user account permissions to add or remove access.
This is how I do it with the older MacOS versions [http://www.theinstructional.com/guides/how-to-re-run-the-os-x-setup-assistant|How to Re-Run the OS X Setup Assistant]. I haven’t tried it under Mojave yet, but I don’t think Apple has altered things.
Do keep in mind the only reason you would need to remove the empty ''.AppleSetupDone'' file is so the system thinks this is the first time setup was run.