The Zip file you downloaded is without packages required for the app to work well

Make sure you have flutter and all necessary libraries installed

Lear more Flutter installation guide

1. Install Packages

1.Open a terminal or command prompt.

2.Navigate to the root directory of your Flutter project where the pubspec.yaml file is located.

3.Run the following commands:

flutter pub get
cd ios
pod repo update
pod install
cd ..
flutter run