Update Windows using Windows Update Assistant

## set computer to not go to sleep

powercfg.exe -x -monitor-timeout-ac 0\
powercfg.exe -x -monitor-timeout-dc 0\
powercfg.exe -x -disk-timeout-ac 0\
powercfg.exe -x -disk-timeout-dc 0\
powercfg.exe -x -standby-timeout-ac 0\
powercfg.exe -x -standby-timeout-dc 0\
powercfg.exe -x -hibernate-timeout-ac 0\
powercfg.exe -x -hibernate-timeout-dc 0


function Write-Log { 
[CmdletBinding()] 
param ( 
	[Parameter(Mandatory)] 
	[string]$Message
) 
  
try { 
	if (!(Test-Path -path ([System.IO.Path]::GetDirectoryName($LogFilePath)))) {
		New-Item -ItemType Directory -Path ([System.IO.Path]::GetDirectoryName($LogFilePath))
	}
	$DateTime = Get-Date -Format ‘yyyy-MM-dd HH:mm:ss’ 
	Add-Content -Value "$DateTime - $Message" -Path $LogFilePath
} 
catch { 
	Write-Error $_.Exception.Message 
} 
}
Function CheckIfElevated() {
Write-Log "Info: Checking for elevated permissions..."
if (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(`
			[Security.Principal.WindowsBuiltInRole] "Administrator")) {
	Write-Log "ERROR: Insufficient permissions to run this script. Open the PowerShell console as an administrator and run this script again."
	return $false
}
else {
	Write-Log "Info: Code is running as administrator — go on executing the script..."
	return $true
}
}

## Main

try {
## Declarations
[string]$DownloadDir = 'C:\Temp\Windows_FU\packages'
[string]$LogDir = 'C:\Temp\Windows_FU\Logs'
[string]$LogFilePath = [string]::Format("{0}\{1}_{2}.log", $LogDir, "$(get-date -format `"yyyyMMdd_hhmmsstt`")", $MyInvocation.MyCommand.Name.Replace(".ps1", ""))
[string]$Url = 'https://go.microsoft.com/fwlink/?LinkID=799445'
[string]$UpdaterBinary = "$($DownloadDir)\Win10Upgrade.exe"
[string]$UpdaterArguments = '/quietinstall /skipeula /auto upgrade /copylogs $LogDir'
[System.Net.WebClient]$webClient = New-Object System.Net.WebClient

## Here the music starts playing .. 
Write-Log -Message ([string]::Format("Info: Script init - User: {0} Machine {1}", $env:USERNAME, $env:COMPUTERNAME))
Write-Log -Message ([string]::Format("Current Windows Version: {0}", [System.Environment]::OSVersion.ToString()))
 
## Check if script is running as admin and elevated  
if (!(CheckIfElevated)) {
	Write-Log -Message "ERROR: Will terminate!"
	break
}

## Check if folders exist
if (!(Test-Path $DownloadDir)) {
	New-Item -ItemType Directory -Path $DownloadDir
}
if (!(Test-Path $LogDir)) {
	New-Item -ItemType Directory -Path $LogDir
}
if (Test-Path $UpdaterBinary) {
	Remove-Item -Path $UpdaterBinary -Force
}
## Download the Windows Update Assistant
Write-Log -Message "Will try to download Windows Update Assistant.."
$webClient.DownloadFile($Url, $UpdaterBinary)

## If the Update Assistant exists -> create a process with argument to initialize the update process
if (Test-Path $UpdaterBinary) {
	Start-Process -FilePath $UpdaterBinary -ArgumentList $UpdaterArguments -Wait
	Write-Log "Fired and forgotten?"
}
else {
	Write-Log -Message ([string]::Format("ERROR: File {0} does not exist!", $UpdaterBinary))
}
}
catch {
Write-Log -Message $_.Exception.Message 
Write-Error $_.Exception.Message 
}