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  • I have after 20 years working with Windows, never have been able to run, SFC from within WinPE. Even if you had installation media it wouldn’t make a difference as your in the exact environment you need to be in, of course without being able to run, SFC or DISM you can’t repair the damaged system files. Windows 10 activation is linked to your hardware, until the end of time, nothing you do can change that.
    – Ramhound
    Commented Nov 1, 2023 at 9:41
  • As you suggest, download and create the USB at microsoft.com/en-us/software-download/windows10 with the media creation tool and perform an install, saving files (not wiping disk). However, make a full disk image first, using tools such as Macrium Reflect Rescue USB, so you can recover data if something goes wrong. Commented Nov 1, 2023 at 13:51