winutil/functions/public/Invoke-WPFUpdatesdisable.ps1

function Invoke-WPFUpdatesdisable {
    <#

    .SYNOPSIS
        Disables Windows Update

    .NOTES
        Disabling Windows Update is not recommended. This is only for advanced users who know what they are doing.

    #>
    If (!(Test-Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU")) {
        New-Item -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" -Force | Out-Null
    }
    Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" -Name "NoAutoUpdate" -Type DWord -Value 1
    Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" -Name "AUOptions" -Type DWord -Value 1
    If (!(Test-Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config")) {
        New-Item -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config" -Force | Out-Null
    }
    Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config" -Name "DODownloadMode" -Type DWord -Value 0

    $services = @(
        "BITS"
        "wuauserv"
    )

    foreach ($service in $services) {
        # -ErrorAction SilentlyContinue is so it doesn't write an error to stdout if a service doesn't exist

        Write-Host "Setting $service StartupType to Disabled"
        Get-Service -Name $service -ErrorAction SilentlyContinue | Set-Service -StartupType Disabled
    }
    Write-Host "================================="
    Write-Host "---   Updates ARE DISABLED    ---"
    Write-Host "================================="
}