#
# Fido v1.17 - Retail Windows ISO Downloader
# Copyright © 2019-2020 Pete Batard <pete@akeo.ie>
# ConvertTo-ImageSource: Copyright © 2016 Chris Carter
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# NB: You must have a BOM on your .ps1 if you want Powershell to actually
# realise it should use Unicode for the UI rather than ISO-8859-1.

#region Parameters
param(
	# (Optional) The title to display on the application window.
	[string]$AppTitle = "Fido - Retail Windows ISO Downloader",
	# (Optional) '|' separated UI localization strings.
	[string]$LocData,
	# (Optional) Path to a file that should be used for the UI icon.
	[string]$Icon,
	# (Optional) Name of a pipe the download URL should be sent to.
	# If not provided, a browser window is opened instead.
	[string]$PipeName,
	# (Optional) Disable IE First Run Customize so that Invoke-WebRequest
	# doesn't throw an exception if the user has never launched IE.
	# Note that this requires the script to run elevated.
	[switch]$DisableFirstRunCustomize
)
#endregion

try {
	[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
} catch {}
Write-Host Please Wait...

#region Assembly Types
$code = @"
[DllImport("shell32.dll", CharSet = CharSet.Auto, SetLastError = true, BestFitMapping = false, ThrowOnUnmappableChar = true)]
	internal static extern int ExtractIconEx(string sFile, int iIndex, out IntPtr piLargeVersion, out IntPtr piSmallVersion, int amountIcons);
[DllImport("user32.dll")]
	public static extern bool ShowWindow(IntPtr handle, int state);

	// Extract an icon from a DLL
	public static Icon ExtractIcon(string file, int number, bool largeIcon)
	{
		IntPtr large, small;
		ExtractIconEx(file, number, out large, out small, 1);
		try {
			return Icon.FromHandle(largeIcon ? large : small);
		} catch {
			return null;
		}
	}
"@

if ($host.version -ge "7.0") {
  Add-Type -MemberDefinition $code -Namespace Gui -UsingNamespace System.Runtime, System.IO, System.Text, System.Drawing, System.Globalization -ReferencedAssemblies System.Drawing.Common -Name Utils -ErrorAction Stop
} else {
  Add-Type -MemberDefinition $code -Namespace Gui -UsingNamespace System.IO, System.Text, System.Drawing, System.Globalization -ReferencedAssemblies System.Drawing -Name Utils -ErrorAction Stop
}
Add-Type -AssemblyName PresentationFramework
# Hide the powershell window: https://stackoverflow.com/a/27992426/1069307
[Gui.Utils]::ShowWindow(([System.Diagnostics.Process]::GetCurrentProcess() | Get-Process).MainWindowHandle, 0) | Out-Null
#endregion

#region Data
$zh = 0x10000
$ko = 0x20000
$WindowsVersions = @(
	@(
		@("Windows 10", "Windows10ISO"),
		@(
			"20H2 (Build 19042.508 - 2020.10)",
			@("Windows 10 Home/Pro", 1807),
			@("Windows 10 Education", 1805),
			@("Windows 10 Home China ", ($zh + 1806))
		),
		@(
			"20H1 (Build 19041.264 - 2020.05)",
			@("Windows 10 Home/Pro", 1626),
			@("Windows 10 Education", 1625),
			@("Windows 10 Home China ", ($zh + 1627))
		),
		@(
			"19H2 (Build 18363.418 - 2019.11)",
			@("Windows 10 Home/Pro", 1429),
			@("Windows 10 Education", 1431),
			@("Windows 10 Home China ", ($zh + 1430))
		),
		@(
			"19H1 (Build 18362.356 - 2019.09)",
			@("Windows 10 Home/Pro", 1384),
			@("Windows 10 Education", 1386),
			@("Windows 10 Home China ", ($zh + 1385))
		),
		@(
			"19H1 (Build 18362.30 - 2019.05)",
			@("Windows 10 Home/Pro", 1214),
			@("Windows 10 Education", 1216),
			@("Windows 10 Home China ", ($zh + 1215))
		),
		@(
			"1809 R2 (Build 17763.107 - 2018.10)",
			@("Windows 10 Home/Pro", 1060),
			@("Windows 10 Education", 1056),
			@("Windows 10 Home China ", ($zh + 1061))
		),
		@(
			"1809 R1 (Build 17763.1 - 2018.09)",
			@("Windows 10 Home/Pro", 1019),
			@("Windows 10 Education", 1021),
			@("Windows 10 Home China ", ($zh + 1020))
		),
		@(
			"1803 (Build 17134.1 - 2018.04)",
			@("Windows 10 Home/Pro", 651),
			@("Windows 10 Education", 655),
			@("Windows 10 1803", 637),
			@("Windows 10 Home China", ($zh + 652))
		),
		@(
			"1709 (Build 16299.15 - 2017.09)",
			@("Windows 10 Home/Pro", 484),
			@("Windows 10 Education", 488),
			@("Windows 10 Home China", ($zh + 485))
		),
		@(
			"1703 [Redstone 2] (Build 15063.0 - 2017.03)",
			@("Windows 10 Home/Pro", 361),
			@("Windows 10 Home/Pro N", 362),
			@("Windows 10 Single Language", 363),
			@("Windows 10 Education", 423),
			@("Windows 10 Education N", 424),
			@("Windows 10 Home China", ($zh + 364))
		),
		@(
			"1607 [Redstone 1] (Build 14393.0 - 2016.07)",
			@("Windows 10 Home/Pro", 244),
			@("Windows 10 Home/Pro N", 245),
			@("Windows 10 Single Language", 246),
			@("Windows 10 Education", 242),
			@("Windows 10 Education N", 243),
			@("Windows 10 China Get Genuine", ($zh + 247))
		),
		@(
			"1511 R3 [Threshold 2] (Build 10586.164 - 2016.04)",
			@("Windows 10 Home/Pro", 178),
			@("Windows 10 Home/Pro N", 183),
			@("Windows 10 Single Language", 184),
			@("Windows 10 Education", 179),
			@("Windows 10 Education N", 181),
			@("Windows 10 KN", ($ko + 182)),
			@("Windows 10 Education KN", ($ko + 180)),
			@("Windows 10 China Get Genuine", ($zh + 185))
		),
		@(
			"1511 R2 [Threshold 2] (Build 10586.104 - 2016.02)",
			@("Windows 10 Home/Pro", 109),
			@("Windows 10 Home/Pro N", 115),
			@("Windows 10 Single Language", 116),
			@("Windows 10 Education", 110),
			@("Windows 10 Education N", 112),
			@("Windows 10 KN", ($ko + 114)),
			@("Windows 10 Education KN", ($ko + 111)),
			@("Windows 10 China Get Genuine", ($zh + 113))
		),
		@(
			"1511 R1 [Threshold 2] (Build 10586.0 - 2015.11)",
			@("Windows 10 Home/Pro", 99),
			@("Windows 10 Home/Pro N", 105),
			@("Windows 10 Single Language", 106),
			@("Windows 10 Education", 100),
			@("Windows 10 Education N", 102),
			@("Windows 10 KN", ($ko + 104)),
			@("Windows 10 Education KN", ($ko + 101)),
			@("Windows 10 China Get Genuine", ($zh + 103))
		),
		@(
			"1507 [Threshold 1] (Build 10240.16384 - 2015.07)",
			@("Windows 10 Home/Pro", 79),
			@("Windows 10 Home/Pro N", 81),
			@("Windows 10 Single Language", 82),
			@("Windows 10 Education", 75)
			@("Windows 10 Education N", 77),
			@("Windows 10 KN", ($ko + 80)),
			@("Windows 10 Education KN", ($ko + 76)),
			@("Windows 10 China Get Genuine", ($zh + 78))
		)
	),
	@(
		@("Windows 8.1", "windows8ISO"),
		@(
			"Update 3 (build 9600)",
			@("Windows 8.1", 52),
			@("Windows 8.1 N", 55)
			@("Windows 8.1 Single Language", 48),
			@("Windows 8.1 K", ($ko + 61)),
			@("Windows 8.1 KN", ($ko + 62))
		)
	)
)
#endregion

#region Functions
function Select-Language([string]$LangName)
{
	# Use the system locale to try select the most appropriate language
	[string]$SysLocale = [System.Globalization.CultureInfo]::CurrentUICulture.Name
	if (($SysLocale.StartsWith("ar") -and $LangName -like "*Arabic*") -or `
		($SysLocale -eq "pt-BR" -and $LangName -like "*Brazil*") -or `
		($SysLocale.StartsWith("ar") -and $LangName -like "*Bulgar*") -or `
		($SysLocale -eq "zh-CN" -and $LangName -like "*Chinese*" -and $LangName -like "*simp*") -or `
		($SysLocale -eq "zh-TW" -and $LangName -like "*Chinese*" -and $LangName -like "*trad*") -or `
		($SysLocale.StartsWith("hr") -and $LangName -like "*Croat*") -or `
		($SysLocale.StartsWith("cz") -and $LangName -like "*Czech*") -or `
		($SysLocale.StartsWith("da") -and $LangName -like "*Danish*") -or `
		($SysLocale.StartsWith("nl") -and $LangName -like "*Dutch*") -or `
		($SysLocale -eq "en-US" -and $LangName -eq "English") -or `
		($SysLocale.StartsWith("en") -and $LangName -like "*English*" -and ($LangName -like "*inter*" -or $LangName -like "*ingdom*")) -or `
		($SysLocale.StartsWith("et") -and $LangName -like "*Eston*") -or `
		($SysLocale.StartsWith("fi") -and $LangName -like "*Finn*") -or `
		($SysLocale -eq "fr-CA" -and $LangName -like "*French*" -and $LangName -like "*Canad*") -or `
		($SysLocale.StartsWith("fr") -and $LangName -eq "French") -or `
		($SysLocale.StartsWith("de") -and $LangName -like "*German*") -or `
		($SysLocale.StartsWith("el") -and $LangName -like "*Greek*") -or `
		($SysLocale.StartsWith("he") -and $LangName -like "*Hebrew*") -or `
		($SysLocale.StartsWith("hu") -and $LangName -like "*Hungar*") -or `
		($SysLocale.StartsWith("id") -and $LangName -like "*Indones*") -or `
		($SysLocale.StartsWith("it") -and $LangName -like "*Italia*") -or `
		($SysLocale.StartsWith("ja") -and $LangName -like "*Japan*") -or `
		($SysLocale.StartsWith("ko") -and $LangName -like "*Korea*") -or `
		($SysLocale.StartsWith("lv") -and $LangName -like "*Latvia*") -or `
		($SysLocale.StartsWith("lt") -and $LangName -like "*Lithuania*") -or `
		($SysLocale.StartsWith("ms") -and $LangName -like "*Malay*") -or `
		($SysLocale.StartsWith("nb") -and $LangName -like "*Norw*") -or `
		($SysLocale.StartsWith("fa") -and $LangName -like "*Persia*") -or `
		($SysLocale.StartsWith("pl") -and $LangName -like "*Polish*") -or `
		($SysLocale -eq "pt-PT" -and $LangName -eq "Portuguese") -or `
		($SysLocale.StartsWith("ro") -and $LangName -like "*Romania*") -or `
		($SysLocale.StartsWith("ru") -and $LangName -like "*Russia*") -or `
		($SysLocale.StartsWith("sr") -and $LangName -like "*Serbia*") -or `
		($SysLocale.StartsWith("sk") -and $LangName -like "*Slovak*") -or `
		($SysLocale.StartsWith("sl") -and $LangName -like "*Slovenia*") -or `
		($SysLocale -eq "es-ES" -and $LangName -eq "Spanish") -or `
		($SysLocale.StartsWith("es") -and $Locale -ne "es-ES" -and $LangName -like "*Spanish*") -or `
		($SysLocale.StartsWith("sv") -and $LangName -like "*Swed*") -or `
		($SysLocale.StartsWith("th") -and $LangName -like "*Thai*") -or `
		($SysLocale.StartsWith("tr") -and $LangName -like "*Turk*") -or `
		($SysLocale.StartsWith("uk") -and $LangName -like "*Ukrain*") -or `
		($SysLocale.StartsWith("vi") -and $LangName -like "*Vietnam*")) {
		return $True
	}
	return $False
}

function Add-Entry([int]$pos, [string]$Name, [array]$Items, [string]$DisplayName)
{
	$Title = New-Object System.Windows.Controls.TextBlock
	$Title.FontSize = $WindowsVersionTitle.FontSize
	$Title.Height = $WindowsVersionTitle.Height;
	$Title.Width = $WindowsVersionTitle.Width;
	$Title.HorizontalAlignment = "Left"
	$Title.VerticalAlignment = "Top"
	$Margin = $WindowsVersionTitle.Margin
	$Margin.Top += $pos * $dh
	$Title.Margin = $Margin
	$Title.Text = Get-Translation($Name)
	$XMLGrid.Children.Insert(2 * $Stage + 2, $Title)

	$Combo = New-Object System.Windows.Controls.ComboBox
	$Combo.FontSize = $WindowsVersion.FontSize
	$Combo.Height = $WindowsVersion.Height;
	$Combo.Width = $WindowsVersion.Width;
	$Combo.HorizontalAlignment = "Left"
	$Combo.VerticalAlignment = "Top"
	$Margin = $WindowsVersion.Margin
	$Margin.Top += $pos * $script:dh
	$Combo.Margin = $Margin
	$Combo.SelectedIndex = 0
	if ($Items) {
		$Combo.ItemsSource = $Items
		if ($DisplayName) {
			$Combo.DisplayMemberPath = $DisplayName
		} else {
			$Combo.DisplayMemberPath = $Name
		}
	}
	$XMLGrid.Children.Insert(2 * $Stage + 3, $Combo)

	$XMLForm.Height += $dh;
	$Margin = $Continue.Margin
	$Margin.Top += $dh
	$Continue.Margin = $Margin
	$Margin = $Back.Margin
	$Margin.Top += $dh
	$Back.Margin = $Margin

	return $Combo
}

function Refresh-Control([object]$Control)
{
	$Control.Dispatcher.Invoke("Render", [Windows.Input.InputEventHandler] { $Continue.UpdateLayout() }, $null, $null)
}

function Send-Message([string]$PipeName, [string]$Message)
{
	[System.Text.Encoding]$Encoding = [System.Text.Encoding]::UTF8
	$Pipe = New-Object -TypeName System.IO.Pipes.NamedPipeClientStream -ArgumentList ".", $PipeName, ([System.IO.Pipes.PipeDirection]::Out), ([System.IO.Pipes.PipeOptions]::None), ([System.Security.Principal.TokenImpersonationLevel]::Impersonation)
	try {
		$Pipe.Connect(1000)
	} catch {
		Write-Host $_.Exception.Message
	}
	$bRequest = $Encoding.GetBytes($Message)
	$cbRequest = $bRequest.Length;
	$Pipe.Write($bRequest, 0, $cbRequest);
	$Pipe.Dispose()
}

# From https://www.powershellgallery.com/packages/IconForGUI/1.5.2
# Copyright © 2016 Chris Carter. All rights reserved.
# License: https://creativecommons.org/licenses/by-sa/4.0/
function ConvertTo-ImageSource
{
	[CmdletBinding()]
	Param(
		[Parameter(Mandatory=$true,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true)]
		[System.Drawing.Icon]$Icon
	)

	Process {
		foreach ($i in $Icon) {
			[System.Windows.Interop.Imaging]::CreateBitmapSourceFromHIcon(
				$i.Handle,
				(New-Object System.Windows.Int32Rect -Args 0,0,$i.Width, $i.Height),
				[System.Windows.Media.Imaging.BitmapSizeOptions]::FromEmptyOptions()
			)
		}
	}
}

function Throw-Error([object]$Req, [string]$Alt)
{
	$Err = $(GetElementById -Request $r -Id "errorModalMessage").innerText
	if (-not $Err) {
		$Err = $Alt
	} else {
		$Err = [System.Text.Encoding]::UTF8.GetString([byte[]][char[]]$Err)
	}
	throw $Err
}

# Translate a message string
function Get-Translation([string]$Text)
{
	if (-not $English -contains $Text) {
		Write-Host "Error: '$Text' is not a translatable string"
		return "(Untranslated)"
	}
	if ($Localized) {
		if ($Localized.Length -ne $English.Length) {
			Write-Host "Error: '$Text' is not a translatable string"
		}
		for ($i = 0; $i -lt $English.Length; $i++) {
			if ($English[$i] -eq $Text) {
				if ($Localized[$i]) {
					return $Localized[$i]
				} else {
					return $Text
				}
			}
		}
	}
	return $Text
}

# Some PowerShells don't have Microsoft.mshtml assembly (comes with MS Office?)
# so we can't use ParsedHtml or IHTMLDocument[2|3] features there...
function GetElementById([object]$Request, [string]$Id)
{
	try {
		return $Request.ParsedHtml.IHTMLDocument3_GetElementByID($Id)
	} catch {
		return $Request.AllElements | ? {$_.id -eq $Id}
	}
}

function Error([string]$ErrorMessage)
{
	Write-Host Error: $ErrorMessage
	$XMLForm.Title = $(Get-Translation("Error")) + ": " + $ErrorMessage
	Refresh-Control($XMLForm)
	$XMLGrid.Children[2 * $script:Stage + 1].IsEnabled = $True
	$UserInput = [System.Windows.MessageBox]::Show($XMLForm.Title,  $(Get-Translation("Error")), "OK", "Error")
	$script:ExitCode = $script:Stage--
}

function Get-RandomDate()
{
	[DateTime]$Min = "1/1/2008"
	[DateTime]$Max = [DateTime]::Now

	$RandomGen = new-object random
	$RandomTicks = [Convert]::ToInt64( ($Max.ticks * 1.0 - $Min.Ticks * 1.0 ) * $RandomGen.NextDouble() + $Min.Ticks * 1.0 )
	$Date = new-object DateTime($RandomTicks)
	return $Date.ToString("yyyyMMdd")
}
#endregion

#region Form
[xml]$XAML = @"
<Window xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" Height = "162" Width = "384" ResizeMode = "NoResize">
	<Grid Name = "XMLGrid">
		<Button Name = "Continue" FontSize = "16" Height = "26" Width = "160" HorizontalAlignment = "Left" VerticalAlignment = "Top" Margin = "14,78,0,0"/>
		<Button Name = "Back" FontSize = "16" Height = "26" Width = "160" HorizontalAlignment = "Left" VerticalAlignment = "Top" Margin = "194,78,0,0"/>
		<TextBlock Name = "WindowsVersionTitle" FontSize = "16" Width="340" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="16,8,0,0"/>
		<ComboBox Name = "WindowsVersion" FontSize = "14" Height = "24" Width = "340" HorizontalAlignment = "Left" VerticalAlignment="Top" Margin = "14,34,0,0" SelectedIndex = "0"/>
		<CheckBox Name = "Check" FontSize = "14" Width = "340" HorizontalAlignment = "Left" VerticalAlignment="Top" Margin = "14,0,0,0" Visibility="Collapsed" />
	</Grid>
</Window>
"@
#endregion

#region Globals
$ErrorActionPreference = "Stop"
$dh = 58;
$Stage = 0
$ltrm = "‎"
$MaxStage = 4
$SessionId = [guid]::NewGuid()
$ExitCode = 100
$Locale = "en-US"
$DFRCKey = "HKLM:\Software\Policies\Microsoft\Internet Explorer\Main\"
$DFRCName = "DisableFirstRunCustomize"
$DFRCAdded = $False
$RequestData = @{}
$RequestData["GetLangs"] = @("a8f8f489-4c7f-463a-9ca6-5cff94d8d041", "getskuinformationbyproductedition" )
$RequestData["GetLinks"] = @("cfa9e580-a81e-4a4b-a846-7b21bf4e2e5b", "GetProductDownloadLinksBySku" )
# Create a semi-random Linux User-Agent string
$FirefoxVersion = Get-Random -Minimum 30 -Maximum 60
$FirefoxDate = Get-RandomDate
$UserAgent = "Mozilla/5.0 (X11; Linux i586; rv:$FirefoxVersion.0) Gecko/$FirefoxDate Firefox/$FirefoxVersion.0"
#endregion

# Localization
$EnglishMessages = "en-US|Version|Release|Edition|Language|Architecture|Download|Continue|Back|Close|Cancel|Error|Please wait...|" +
	"Download using a browser|Temporarily banned by Microsoft for requesting too many downloads - Please try again later...|" +
	"PowerShell 3.0 or later is required to run this script.|Do you want to go online and download it?"
[string[]]$English = $EnglishMessages.Split('|')
[string[]]$Localized = $null
if ($LocData -and (-not $LocData.StartsWith("en-US"))) {
	$Localized = $LocData.Split('|')
	if ($Localized.Length -ne $English.Length) {
		Write-Host "Error: Missing or extra translated messages provided ($($Localized.Length)/$($English.Length))"
		exit 101
	}
	$Locale = $Localized[0]
}
$QueryLocale = $Locale

# Make sure PowerShell 3.0 or later is used (for Invoke-WebRequest)
if ($PSVersionTable.PSVersion.Major -lt 3) {
	Write-Host Error: PowerShell 3.0 or later is required to run this script.
	$Msg = "$(Get-Translation($English[15]))`n$(Get-Translation($English[16]))"
	if ([System.Windows.MessageBox]::Show($Msg, $(Get-Translation("Error")), "YesNo", "Error") -eq "Yes") {
		Start-Process -FilePath https://www.microsoft.com/download/details.aspx?id=34595
	}
	exit 102
}

# If asked, disable IE's first run customize prompt as it interferes with Invoke-WebRequest
if ($DisableFirstRunCustomize) {
	try {
		# Only create the key if it doesn't already exist
		Get-ItemProperty -Path $DFRCKey -Name $DFRCName
	} catch {
		if (-not (Test-Path $DFRCKey)) {
			New-Item -Path $DFRCKey -Force | Out-Null
		}
		Set-ItemProperty -Path $DFRCKey -Name $DFRCName -Value 1
		$DFRCAdded = $True
	}
}

# Form creation
$XMLForm = [Windows.Markup.XamlReader]::Load((New-Object System.Xml.XmlNodeReader $XAML))
$XAML.SelectNodes("//*[@Name]") | ForEach-Object { Set-Variable -Name ($_.Name) -Value $XMLForm.FindName($_.Name) -Scope Script }
$XMLForm.Title = $AppTitle
if ($Icon) {
	$XMLForm.Icon = $Icon
} else {
	$XMLForm.Icon = [Gui.Utils]::ExtractIcon("shell32.dll", -41, $true) | ConvertTo-ImageSource
}
if ($Locale.StartsWith("ar") -or  $Locale.StartsWith("fa") -or $Locale.StartsWith("he")) {
	$XMLForm.FlowDirection = "RightToLeft"
}
$WindowsVersionTitle.Text = Get-Translation("Version")
$Continue.Content = Get-Translation("Continue")
$Back.Content = Get-Translation("Close")

# Populate the Windows versions
$i = 0
$array = @()
foreach($Version in $WindowsVersions) {
	$array += @(New-Object PsObject -Property @{ Version = $Version[0][0]; PageType = $Version[0][1]; Index = $i })
	$i++
}
$WindowsVersion.ItemsSource = $array
$WindowsVersion.DisplayMemberPath = "Version"

# Button Action
$Continue.add_click({
	$script:Stage++
	$XMLGrid.Children[2 * $Stage + 1].IsEnabled = $False
	$Continue.IsEnabled = $False
	$Back.IsEnabled = $False
	Refresh-Control($Continue)
	Refresh-Control($Back)

	switch ($Stage) {

		1 { # Windows Version selection
			$XMLForm.Title = Get-Translation($English[12])
			Refresh-Control($XMLForm)
			# Check if the locale we want is available - Fall back to en-US otherwise
			try {
				$url = "https://www.microsoft.com/" + $QueryLocale + "/software-download/"
				Write-Host Querying $url
				Invoke-WebRequest -UseBasicParsing -MaximumRedirection 0 -UserAgent $UserAgent $url | Out-Null
			} catch {
				$script:QueryLocale = "en-US"
			}

			$i = 0
			$array = @()
			foreach ($Version in $WindowsVersions[$WindowsVersion.SelectedValue.Index]) {
				if (($i -ne 0) -and ($Version -is [array])) {
					$array += @(New-Object PsObject -Property @{ Release = $ltrm + $Version[0].Replace(")", ")" + $ltrm); Index = $i })
				}
				$i++
			}

			$script:WindowsRelease = Add-Entry $Stage "Release" $array
			$Back.Content = Get-Translation($English[8])
			$XMLForm.Title = $AppTitle
		}

		2 { # Windows Release selection => Populate Product Edition
			$array = @()
			foreach ($Release in  $WindowsVersions[$WindowsVersion.SelectedValue.Index][$WindowsRelease.SelectedValue.Index])
			{
				if ($Release -is [array]) {
					if (($Release[1] -lt 0x10000) -or ($Locale.StartsWith("ko") -and ($Release[1] -band $ko)) -or ($Locale.StartsWith("zh") -and ($Release[1] -band $zh))) {
						$array += @(New-Object PsObject -Property @{ Edition = $Release[0]; Id = $($Release[1] -band 0xFFFF) })
					}
				}
			}
			$script:ProductEdition = Add-Entry $Stage "Edition" $array
		}

		3 { # Product Edition selection => Request and populate Languages
			$XMLForm.Title = Get-Translation($English[12])
			Refresh-Control($XMLForm)
			$url = "https://www.microsoft.com/" + $QueryLocale + "/api/controls/contentinclude/html"
			$url += "?pageId=" + $RequestData["GetLangs"][0]
			$url += "&host=www.microsoft.com"
			$url += "&segments=software-download," + $WindowsVersion.SelectedValue.PageType
			$url += "&query=&action=" + $RequestData["GetLangs"][1]
			$url += "&sessionId=" + $SessionId
			$url += "&productEditionId=" + [Math]::Abs($ProductEdition.SelectedValue.Id)
			$url += "&sdVersion=2"
			Write-Host Querying $url

			$array = @()
			$i = 0
			$SelectedIndex = 0
			try {
				$r = Invoke-WebRequest -UserAgent $UserAgent -SessionVariable "Session" $url
				# Go through an XML conversion to keep all PowerShells happy...
				if (-not $($r.AllElements | ? {$_.id -eq "product-languages"})) {
					if ($host.version -ge "7.0") {
						throw "This PowerShell version can not parse HTML"
					} else {
						throw "Unexpected server response"
					}
				}
				$html = $($r.AllElements | ? {$_.id -eq "product-languages"}).InnerHTML
				$html = $html.Replace("selected value", "value")
				$html = $html.Replace("&", "&amp;")
				$html = "<options>" + $html + "</options>"
				$xml = [xml]$html
				foreach ($var in $xml.options.option) {
					$json = $var.value | ConvertFrom-Json;
					if ($json) {
						$array += @(New-Object PsObject -Property @{ DisplayLanguage = $var.InnerText; Language = $json.language; Id = $json.id })
						if (Select-Language($json.language)) {
							$SelectedIndex = $i
						}
						$i++
					}
				}
				if ($array.Length -eq 0) {
					Throw-Error -Req $r -Alt "Could not parse languages"
				}
			} catch {
				Error($_.Exception.Message)
				break
			}
			$script:Language = Add-Entry $Stage "Language" $array "DisplayLanguage"
			$Language.SelectedIndex = $SelectedIndex
			$XMLForm.Title = $AppTitle
		}

		4 { # Language selection => Request and populate Arch download links
			$XMLForm.Title = Get-Translation($English[12])
			Refresh-Control($XMLForm)
			$url = "https://www.microsoft.com/" + $QueryLocale + "/api/controls/contentinclude/html"
			$url += "?pageId=" + $RequestData["GetLinks"][0]
			$url += "&host=www.microsoft.com"
			$url += "&segments=software-download," + $WindowsVersion.SelectedValue.PageType
			$url += "&query=&action=" + $RequestData["GetLinks"][1]
			$url += "&sessionId=" + $SessionId
			$url += "&skuId=" + $Language.SelectedValue.Id
			$url += "&language=" + $Language.SelectedValue.Language
			$url += "&sdVersion=2"
			Write-Host Querying $url

			$i = 0
			$SelectedIndex = 0
			$array = @()
			try {
				$Is64 = [Environment]::Is64BitOperatingSystem
				$r = Invoke-WebRequest -UserAgent $UserAgent -WebSession $Session $url
				if (-not $($r.AllElements | ? {$_.id -eq "expiration-time"})) {
					Throw-Error -Req $r -Alt Get-Translation($English[14])
				}
				$html = $($r.AllElements | ? {$_.tagname -eq "input"}).outerHTML
				# Need to fix the HTML and JSON data so that it is well-formed
				$html = $html.Replace("class=product-download-hidden", "")
				$html = $html.Replace("type=hidden", "")
				$html = $html.Replace(">", "/>")
				$html = $html.Replace("&nbsp;", " ")
				$html = $html.Replace("IsoX86", """x86""")
				$html = $html.Replace("IsoX64", """x64""")
				$html = "<inputs>" + $html + "</inputs>"
				$xml = [xml]$html
				foreach ($var in $xml.inputs.input) {
					$json = $var.value | ConvertFrom-Json;
					if ($json) {
						if (($Is64 -and $json.DownloadType -eq "x64") -or (-not $Is64 -and $json.DownloadType -eq "x86")) {
							$SelectedIndex = $i
						}
						$array += @(New-Object PsObject -Property @{ Type = $json.DownloadType; Link = $json.Uri })
						$i++
					}
				}
				if ($array.Length -eq 0) {
					Throw-Error -Req $r -Alt "Could not retrieve ISO download links"
				}
			} catch {
				Error($_.Exception.Message)
				break
			}

			$script:Arch = Add-Entry $Stage "Architecture" $array "Type"
			if ($PipeName) {
				$XMLForm.Height += $dh / 2;
				$Margin = $Continue.Margin
				$top = $Margin.Top
				$Margin.Top += $dh /2
				$Continue.Margin = $Margin
				$Margin = $Back.Margin
				$Margin.Top += $dh / 2
				$Back.Margin = $Margin
				$Margin = $Check.Margin
				$Margin.Top = $top - 2
				$Check.Margin = $Margin
				$Check.Content = Get-Translation($English[13])
				$Check.Visibility = "Visible"
			}
			$Arch.SelectedIndex = $SelectedIndex
			$Continue.Content = Get-Translation("Download")
			$XMLForm.Title = $AppTitle
		}

		5 { # Arch selection => Return selected download link
			if ($PipeName -and -not $Check.IsChecked) {
				Send-Message -PipeName $PipeName -Message $Arch.SelectedValue.Link
			} else {
				Write-Host Download Link: $Arch.SelectedValue.Link
				Start-Process -FilePath $Arch.SelectedValue.Link
			}
			$script:ExitCode = 0
			$XMLForm.Close()
		}
	}
	$Continue.IsEnabled = $True
	if ($Stage -ge 0) {
		$Back.IsEnabled = $True
	}
})

$Back.add_click({
	if ($Stage -eq 0) {
		$XMLForm.Close()
	} else {
		$XMLGrid.Children.RemoveAt(2 * $Stage + 3)
		$XMLGrid.Children.RemoveAt(2 * $Stage + 2)
		$XMLGrid.Children[2 * $Stage + 1].IsEnabled = $True
		$dh2 = $dh
		if ($Stage -eq 4 -and $PipeName) {
			$Check.Visibility = "Collapsed"
			$dh2 += $dh / 2
		}
		$XMLForm.Height -= $dh2;
		$Margin = $Continue.Margin
		$Margin.Top -= $dh2
		$Continue.Margin = $Margin
		$Margin = $Back.Margin
		$Margin.Top -= $dh2
		$Back.Margin = $Margin
		$script:Stage = $Stage - 1
		$XMLForm.Title = $AppTitle
		if ($Stage -eq 0) {
			$Back.Content = Get-Translation("Close")
		} else {
			$Continue.Content = Get-Translation("Continue")
			Refresh-Control($Continue)
		}
	}
})

# Display the dialog
$XMLForm.Add_Loaded( { $XMLForm.Activate() } )
$XMLForm.ShowDialog() | Out-Null

# Clean up & exit
if ($DFRCAdded) {
	Remove-ItemProperty -Path $DFRCKey -Name $DFRCName
}
exit $ExitCode