🎮 Steam Manifest Downloader

A sleek desktop app for downloading Steam game depots using manifest data.

Upload .lua files, search across GitHub repos, and let the app handle manifests, depot keys, and downloads — all in one click.

Warning

⚠️ Legal Disclaimer

This project does NOT support or encourage piracy in any way.

DepotDownloaderMod must ONLY be used with your own legally obtained Steam keys.
This tool is intended for legitimate use cases only (e.g., downloading your own purchased content, archiving, backup, etc.).
The developer takes no responsibility for any misuse of this tool.
By using this software, you agree to comply with all applicable laws and Steam's Terms of Service.

✨ Features

	Feature
📂	Drag & drop `.lua` file upload
🔍	Multi-repo search via Internet Archive
📦	Automatic manifest download from Internet Archive
🔑	Automatic depot keys generation
⚡	Integrated DepotDownloader execution
📊	Real-time download progress tracking
🎮	Steam Store API integration — game names + cover art
🌙	Dark / Light theme support
⚙️	Configurable download location & GitHub token
🔒	Fully self-contained — DepotDownloaderMod embedded

🚀 Quick Start

How it works — in 5 steps:

📥 Download the installer from Releases
📂 Upload your .lua file or search for a game
✅ Select the depots and manifests you want
🚀 Click Download — everything happens automatically
✨ Done! Files are in your configured download folder

💻 System Requirements

	Requirement	Details
💻	Operating System	Windows 10 / 11 (64-bit) or a modern Linux distro (glibc ≥ 2.35)
⚙️	Runtime (Windows)	.NET 9.0 Runtime — required by DepotDownloader
📦	Runtime (Linux)	`webkit2gtk-4.1`, `libayatana-appindicator3`, `librsvg2` (install commands below)
🌐	Network	Internet connection

📥 Installation

🪟 Windows

Head to the Releases page and download the latest .exe installer (NSIS)
Run the installer — installs per-user, no admin required
Launch Steam Manifest Downloader from the Start Menu

Note

Make sure you have the .NET 9.0 Runtime installed. The app will warn you on first launch if it's missing.

🐧 Linux

Arch / CachyOS / Manjaro — AUR

The cleanest path on Arch-based distros: an official AUR package handled by pacman. Two variants:

# Precompiled — installs in seconds, pulls the AppImage binary from the GitHub release
paru -S steam-manifest-downloader-bin

# From source — recompiles the Rust binary locally (~5 min on a modern CPU)
paru -S steam-manifest-downloader

Both packages provide/conflict each other, so you only ever have one installed. The -bin flavor is recommended unless you want a reproducible local build.

Sources: steam-manifest-downloader-bin · steam-manifest-downloader. Updates flow through your package manager (paru -Syu), and the in-app updater detects this and points you back at it instead of fetching an AppImage.

Other distros — AppImage

Download the latest .AppImage from Releases.

Tauri apps on Linux don't bundle their own browser engine — they render the UI through the system WebKitGTK. Install the runtime for your distro:

Ubuntu / Debian (22.04+ / 12+)

sudo apt install libwebkit2gtk-4.1-0 libayatana-appindicator3-1 librsvg2-2

Arch / CachyOS / Manjaro

sudo pacman -S webkit2gtk-4.1 libayatana-appindicator librsvg

Fedora

sudo dnf install webkit2gtk4.1 libappindicator-gtk3 librsvg2

openSUSE (Tumbleweed / Leap 15.6+)

sudo zypper install libwebkit2gtk-4_1-0 libayatana-appindicator3-1 librsvg-2-2

Then make the AppImage executable and launch it:

chmod +x Steam\ Manifest\ Downloader_*_amd64.AppImage
./Steam\ Manifest\ Downloader_*_amd64.AppImage

Note

On NixOS, portable binaries can't find system libs through the normal loader paths. Launch via steam-run ./Steam\ Manifest\ Downloader_*_amd64.AppImage, or wrap the binary in a Nix derivation that lists webkitgtk_4_1, libayatana-appindicator, librsvg and gtk3 as build inputs.

🔧 Building from Source

Prerequisites

Rust (latest stable) + Cargo — Install via rustup
Tauri CLI — cargo install tauri-cli
.NET SDK 9.0 — Only needed if building DepotDownloaderMod from source (Download)
Linux additional: libwebkit2gtk-4.1-dev, libappindicator3-dev, librsvg2-dev, patchelf (for AppImage)

Step 1: Building DepotDownloaderMod (optional)

The project embeds DepotDownloaderMod binaries at compile time. Pre-built versions are already included in the repo:

DepotDownloaderMod-Windows/ — Windows build (framework-dependent, requires .NET runtime)
DepotDownloaderMod-linux-full/ — Linux build (self-contained, no runtime needed)

If you want to build DepotDownloaderMod yourself:

Source: github.com/SteamAutoCracks/DepotDownloaderMod

Windows (framework-dependent)

git clone https://github.com/SteamAutoCracks/DepotDownloaderMod.git
cd DepotDownloaderMod
dotnet publish -c Release -o ./publish-windows

Copy all files from publish-windows/ to DepotDownloaderMod-Windows/ in this project:

DepotDownloaderMod.exe
DepotDownloaderMod.dll
DepotDownloaderMod.deps.json
DepotDownloaderMod.runtimeconfig.json
SteamKit2.dll
protobuf-net.Core.dll
protobuf-net.dll
QRCoder.dll
System.IO.Hashing.dll
ZstdSharp.dll

Linux (self-contained, NO trimming)

git clone https://github.com/SteamAutoCracks/DepotDownloaderMod.git
cd DepotDownloaderMod
dotnet publish -c Release -r linux-x64 --self-contained true \
    -p:PublishSingleFile=true -o ./publish-linux

[!CAUTION] Do NOT use -p:PublishTrimmed=true — .NET trimming removes reflection metadata needed by SteamKit2/protobuf-net, causing "A task was canceled" errors at runtime.

Copy publish-linux/DepotDownloaderMod to DepotDownloaderMod-linux-full/DepotDownloaderMod in this project.

Step 2: Building the Tauri App

Windows

cargo tauri build

Output:

NSIS installer: src-tauri/target/release/bundle/nsis/
Portable executable: src-tauri/target/release/steam-manifest-downloader.exe

Linux (Arch/CachyOS/etc.)

NO_STRIP=true APPIMAGE_EXTRACT_AND_RUN=1 cargo tauri build

Output: src-tauri/target/release/bundle/appimage/Steam Manifest Downloader_1.0.0_amd64.AppImage

[!NOTE] NO_STRIP=true prevents stripping symbols from the embedded .NET binary. APPIMAGE_EXTRACT_AND_RUN=1 is needed on some distros for the AppImage bundler.

Project Structure (for reference)

The include_bytes! macro in src-tauri/src/services/embedded_tools.rs embeds the DDM binaries at compile time:

Windows build reads from DepotDownloaderMod-Windows/
Linux build reads from DepotDownloaderMod-linux-full/

[!IMPORTANT] The DDM binary files must be in place before running cargo tauri build. The Rust compiler reads them via include_bytes! at compile time — if the files are missing, the build will fail.

🛠️ Tech Stack

Layer	Technology
Backend	Rust, reqwest, tokio, serde
Frontend	HTML / CSS / JS (vanilla)
Framework	Tauri v2
Downloader	DepotDownloaderMod (.NET 8)

📁 Project Structure

DepoDownloaderWebApp/
├── public/                     # Frontend (HTML/CSS/JS)
│   ├── index.html              # Main UI
│   ├── css/style.css           # Styles & themes
│   └── js/app.js               # Application logic
├── src-tauri/
│   ├── src/
│   │   ├── main.rs             # Tauri entry point
│   │   ├── commands/           # Tauri command handlers
│   │   │   ├── download.rs     # Download orchestration
│   │   │   ├── search.rs       # Game search
│   │   │   ├── file_ops.rs     # File operations
│   │   │   ├── settings.rs     # App settings
│   │   │   ├── system.rs       # System utilities
│   │   │   └── window.rs       # Window controls
│   │   └── services/           # Business logic
│   │       ├── github_api.rs   # GitHub API client
│   │       ├── manifest_hub_api.rs
│   │       ├── steam_store_api.rs
│   │       ├── depot_runner.rs # DepotDownloaderMod runner
│   │       ├── lua_parser.rs   # .lua file parser
│   │       └── ...
│   ├── Cargo.toml              # Rust dependencies
│   └── tauri.conf.json         # Tauri configuration
├── DepotDownloaderMod/         # Embedded .NET tool
├── assets/                     # App icons
└── README.md

📄 License

This project is licensed under the GPL-2.0 License.

🙏 Credits & Acknowledgments

DepotDownloaderMod — Steam depot downloading engine
Steam Store API — Game metadata & artwork
Tauri — Desktop application framework

Made with ❤️ and 🦀

Name		Name	Last commit message	Last commit date
Latest commit History 92 Commits
.github		.github
assets		assets
docs		docs
packaging/flatpak		packaging/flatpak
public		public
src-tauri		src-tauri
tools/telemetry-server		tools/telemetry-server
.gitignore		.gitignore
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
PRIVACY.md		PRIVACY.md
README.md		README.md
SECURITY.md		SECURITY.md

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🎮 Steam Manifest Downloader

⚠️ Legal Disclaimer

✨ Features

🚀 Quick Start

💻 System Requirements

📥 Installation

🪟 Windows

🐧 Linux

Arch / CachyOS / Manjaro — AUR

Other distros — AppImage

Prerequisites

Step 1: Building DepotDownloaderMod (optional)

Windows (framework-dependent)

Linux (self-contained, NO trimming)

Step 2: Building the Tauri App

Windows

Linux (Arch/CachyOS/etc.)

Project Structure (for reference)

🛠️ Tech Stack

📄 License

🙏 Credits & Acknowledgments

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🎮 Steam Manifest Downloader

⚠️ Legal Disclaimer

✨ Features

🚀 Quick Start

💻 System Requirements

📥 Installation

🪟 Windows

🐧 Linux

Arch / CachyOS / Manjaro — AUR

Other distros — AppImage

Prerequisites

Step 1: Building DepotDownloaderMod (optional)

Windows (framework-dependent)

Linux (self-contained, NO trimming)

Step 2: Building the Tauri App

Windows

Linux (Arch/CachyOS/etc.)

Project Structure (for reference)

🛠️ Tech Stack

📄 License

🙏 Credits & Acknowledgments

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