VEIN Mod Loader

A mod manager for the VEIN game. Handles enabling and disabling .pak mods, Steam auto-detection, multiple profiles, and game launching - all in one place.

Created by Tsardev

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Download

Get the latest release from the Releases page.

v2.0.0 SHA256 Checksum:

a93ac7c900ecbb6cc30694865cb4dab22846ca86cd2f3c362e7bab28efae8075

Verify your download in PowerShell:

Get-FileHash "Vein_Mod_Loader_v2.0.0.zip" -Algorithm SHA256

Or run verify_checksum.bat included in the release. This will show the actual has of the .exe versus what it should be as stated above.

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Features

• Steam auto-detection across all library folders
• Enable / disable .pak mods individually or all at once
• Multiple profiles — up to 10, each with its own paths and config
• Profile switching saves your current state before swapping
• Search / filter mod list
• Custom game launch arguments
• Splash screen on startup
• Update checker — notifies you in the status bar when a new release is available
• Portable config — change where settings are stored from inside the app

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Installation

Standalone EXE (recommended)

1. Download Vein_Mod_Loader_v2.0.0.zip from the releases page
2. Extract the zip
3. Run Vein_Mod_Loader.exe
4. No Python required

Run from source

Requirements: Python 3.8+, Windows 10/11

git clone https://github.com/mikeybowman/vein_mod_loader.git
cd vein_mod_loader
pip install -r requirements.txt
python vein_app.py

Build your own EXE

build.bat

Output will be at dist\Vein_Mod_Loader.exe.

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First Time Setup

1. Launch the app
2. Click Auto-Detect — finds your VEIN install via Steam automatically
3. If auto-detect misses it, use Browse to set paths manually:
   • Game Executable — path to VEIN.exe
   • Mod Folder — where your modded .pak files are stored
   • Game Data — where mods get installed (usually VEIN\Content\Paks)
4. Click Save Configuration

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Managing Mods

Action	How
Enable / disable a mod	Double-click it
Enable / disable selected	Use the buttons below the list
Enable all	Enable All button - confirms before running
Disable all	Disable All button - only removes mods it installed, never touches vanilla files
Search	Type in the search box above the list

Status indicators: ✅ Enabled / ❌ Disabled

Right-click a mod for quick enable/disable from the context menu.

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Profiles

• Create up to 10 profiles with separate path configs
• Switch via the dropdown in the Mod Manager tab or double-click in the Profiles tab
• Switching profiles saves your current state automatically before swapping
• Default profile cannot be deleted

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Settings

• Launch Arguments — extra flags passed to VEIN on launch (e.g. -windowed -nointro)
• Configuration Location — move your config folder to a custom path
• GitHub - opens this repository

Config is stored by default at:

%APPDATA%\VeinModLoader\config.json

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File Structure

Vein_Mod_Loader/
├── img/
│   ├── VEIN.ico
│   ├── VEIN.png
│   ├── vein_splash.png
│   └── github_icon.png
├── vein_app.py
├── vein_core.py
├── vein_config.py
├── vein_theme.py
├── vein_app.spec
├── version_info.py
├── requirements.txt
├── build.bat
└── README.md

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Troubleshooting

Game not found

• Click Auto-Detect
• Manually browse to VEIN.exe

Mods not enabling

• Check that the Game Data path ends in \Content\Paks
• Make sure you have write permission to that folder
• Confirm your mods are .pak files

Mods not showing in the list

• Check the Mod Folder path is set correctly
• Click Refresh List
• Make sure the folder contains .pak files

Steam not detected

• Steam detection is optional — paths can be set manually
• Make sure Steam is installed in a standard location

Settings reverting on launch

• Delete %APPDATA%\VeinModLoader\config.json and reconfigure fresh

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Security

This app is open source — the full source is in this repo. Always verify downloads using the SHA256 checksum provided on each release.

Permissions the app needs:

• Read/write access to your mod folder and game data folder
• Read access to Steam registry keys (for auto-detect)
• Write access to %APPDATA%\VeinModLoader for config storage

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Contributing

1. Fork the repo
2. Create a branch
3. Make your changes
4. Test on a real VEIN install
5. Open a pull request

Bug reports and feature requests go in Issues.

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License

Open source. Not affiliated with the VEIN game developers.