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Just follow this link : https://flutter.dev/docs/get-started/install
And follow each and every step
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C:\src>git clone https://github.com/flutter/flutter.git -b stable
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where flutter dart
C:\path-to-flutter-sdk\bin\flutter
C:\path-to-flutter-sdk\bin\flutter.bat
C:\path-to-dart-sdk\bin\dart.exe :: this should go after `C:\path-to-flutter-sdk\bin\` commands
C:\path-to-flutter-sdk\bin\dart
C:\path-to-flutter-sdk\bin\dart.bat
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flutter pub add firebase_core_desktop
flutter pub add firebase_auth_desktop