Quick Tip: Disable UAC from the command line

Using elevated command prompt, run:

c:\> reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f

This will also disable "User Account Control: Turn on Admin Approval Mode."

Reference(s)
https://www.top-password.com/blog/tag/disable-uac-from-command-line/