Update version and copyright year

* Microsoft updated 20H2 in December. Make sure we enable those downloads too.
* Closes #21

Fido.ps1

@@ -1,6 +1,6 @@
 #
-# Fido v1.16 - Retail Windows ISO Downloader
+# Fido v1.18 - Retail Windows ISO Downloader
-# Copyright © 2019-2020 Pete Batard <pete@akeo.ie>
+# Copyright © 2019-2021 Pete Batard <pete@akeo.ie>
 # ConvertTo-ImageSource: Copyright © 2016 Chris Carter
 #
 # This program is free software: you can redistribute it and/or modify
@@ -63,7 +63,11 @@ $code = @"
 	}
 "@
 
-Add-Type -MemberDefinition $code -Namespace Gui -UsingNamespace "System.IO", "System.Text", "System.Drawing", "System.Globalization" -ReferencedAssemblies System.Drawing -Name Utils -ErrorAction Stop
+if ($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
@@ -75,6 +79,18 @@ $ko = 0x20000
 $WindowsVersions = @(
 	@(
 		@("Windows 10", "Windows10ISO"),
+		@(
+			"20H2 (Build 19042.631 - 2020.12)",
+			@("Windows 10 Home/Pro", 1882),
+			@("Windows 10 Education", 1884),
+			@("Windows 10 Home China ", ($zh + 1883))
+		),
+		@(
+			"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),
@@ -576,10 +592,14 @@ $Continue.add_click({
 			$i = 0
 			$SelectedIndex = 0
 			try {
-				$r = Invoke-WebRequest -UserAgent $UserAgent -WebSession $Session $url
+				$r = Invoke-WebRequest -UserAgent $UserAgent -SessionVariable "Session" $url
 				# Go through an XML conversion to keep all PowerShells happy...
 				if (-not $($r.AllElements | ? {$_.id -eq "product-languages"})) {
-					throw "Unexpected server response"
+					if ($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")