LostieLauncher

Modern game launcher for Windows

Discover, download, install, and manage your games from a clean interface with multi-language support.

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✨ Features

Feature	Description
🎮 Game library	Browse the full catalog of available games from the content server
⬇️ Resumable downloads	Supports pausing and resuming downloads with .part files and a real-time progress bar
🔑 Key system	Access to exclusive content via download keys validated by the server
🕹️ My games	Dedicated view with installed games, version tracking and playtime
🔄 Automatic updates	Delta updates with Velopack — the launcher updates itself
📰 News and notifications	News feed and announcements from the home screen
🎨 Themes	10 swappable visual themes: Volcarona, Zoroark, Cefireon, Sylveon, Infernape, Torterra, Empoleon, Mewtwo, Astrem, and Auretoskos
🌍 Multi-language	8 available languages with full UI translations
💾 Save shortcut	Quick-access button to open the save folder of an installed game
📺 Social links	Direct buttons to open EricLostie's Twitch, YouTube, and Twitter from the main UI
🖥️ System tray	Minimize to tray with a context menu (Open / Exit)
🚀 Start with Windows	Option to launch the launcher on login, in normal or minimized mode

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🌍 Supported languages

Español · English · Català · Euskera · Galego · Português · Valencià · Français

The language is selected in the settings and applied dynamically throughout the application.

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🏗️ Architecture

The project follows the MVVM pattern with centralized Dependency Injection.

LostieLauncher/
├── Core/               # DI container configuration
├── Models/             # Data models
├── Services/           # Service layer
├── ViewModels/         # ViewModels with CommunityToolkit.Mvvm
├── Views/              # Windows, dialogs and WPF components
│   ├── Components/     # GameCard, NewsCard, NotificationCard
│   ├── Dialogs/        # DownloadConfirmDialog, WelcomeDialog, CustomMessageBox, SpecialVersionDialog
│   └── Partials/       # GamesView, HomeView, LibraryView, SettingsView
├── Converters/         # XAML value converters
├── Styles/             # Global styles
├── Themes/             # Theme resources
├── Content/            # Localized strings
├── Utils/              # Logging and process utilities
└── Assets/             # Icons and graphic resources

Main services

Service	Responsibility
IContentService	Fetches the game catalog, news, and registers installed games
IDownloadService	Manages downloads, file extraction, and the key system
ISettingsService	Loads and persists configuration in launcher_settings.json
ITelemetryService	Sends download data and queries statistics
IWindowsStartupService	Integration with the Windows registry for automatic startup

ViewModels

ViewModel	View
MainViewModel	Main navigation hub
HomeViewModel	Home screen with news and notifications
LibraryViewModel	Available game catalog and download management
GamesViewModel	Installed games
SettingsViewModel	Settings panel
GlobalViewModel	Shared global state

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🛠️ Technologies

Package	Version	Usage
CommunityToolkit.Mvvm	8.4.2	MVVM with ObservableProperty and RelayCommand
MahApps.Metro.IconPacks	6.2.1	Vector icons in the UI
Microsoft.Extensions.DependencyInjection	10.0.6	IoC container
Microsoft.Extensions.Http	10.0.6	IHttpClientFactory with named clients
SharpCompress	0.47.4	ZIP/7z extraction of downloaded files
Velopack	0.0.1298	Automatic delta update system

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🚀 Build and publish

Prerequisites

• .NET 10 SDK
• Windows 10/11
• PowerShell 7+ (for the release script)
• vpk Velopack CLI installed globally

Development build

cd LostieLauncher
dotnet build

Release build (local)

.\scripts\build-release.ps1

Artifacts are generated in releases/:

• LostieLauncher-0.8.9-full.nupkg — initial installation package
• Delta packages (on successive builds)
• releases.win.json — update manifest
• RELEASES — Velopack metadata

Release build with server upload

.\scripts\build-release.ps1 -Upload -SshHost "user@my-server.com" -SshPath "/var/www/installer/"

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⚙️ Configuration

Configuration is automatically saved to launcher_settings.json next to the executable.

Option	Type	Default	Description
Language	AppLanguage	Esp	Interface language
Theme	AppTheme	Volcarona	Visual theme
StartWithWindows	bool	false	Launch on Windows startup
StartMinimized	bool	false	Start in the system tray
AutoUpdate	bool	false	Check for updates on startup
DownloadDirectory	string	My Documents	Game installation folder
HasSeenWelcome	bool	false	Controls whether the welcome dialog is shown

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📡 API Endpoints

Endpoint	Description
https://ericlostie-launcher.jagoba.dev/games/listado.json	Available game catalog
https://cdn.jagoba.dev/ericlostie-launcher/homepage-notifications.json	Home screen news and notifications
https://ericlostie-launcher.jagoba.dev/games	Base URL for downloads
https://ericlostie-launcher.jagoba.dev/public/installer/	Velopack update feed

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