Not another part inventory management system ... this is particulous!

An installation of Flutter is neded.
Follow these steps to install it.
Also if you are using the Dart extension for VSCode (below) don't forget to set the variable dart.flutterSdkPath of VSCode to the installation folder of Flutter.
The easiest way is to use Visual Studio Code plus some Extensions for it:
To build database classes run dart run build_runner build
To build the project for windows run flutter build windows