git clone -b master https://github.com/flutter/flutter.git
or
flutter channel master
flutter upgrade
flutter doctor
set ENABLE_FLUTTER_DESKTOP=true
flutter devices
git clone https://github.com/google/flutter-desktop-embedding.git
cd example
flutter packages get
flutter run
new project
copy ..\flutter-desktop-embedding\example\windows .
add lib/main.dart
import 'dart:io' show Platform;
import 'package:flutter/foundation.dart' show debugDefaultTargetPlatformOverride;
void main() {
// See https://github.com/flutter/flutter/wiki/Desktop-shells#target-platform-override
debugDefaultTargetPlatformOverride = TargetPlatform.fuchsia;
runApp(new MyApp()); }