This script just added single key to the registry and rebooted the machine (restarting the installer). The underlying functionality which allowed to use local user, if registry key was present, was coded into the installer itself.

So if they just removed that 2-line bat file, it's not a big problem. You still can add that entry to the registry, just with more complicated command.

Here's its code:

    @echo off
    reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\OOBE /v BypassNRO /t REG_DWORD /d 1 /f
    shutdown /r /t 0