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BCML: BOTW Cross-Platform Mod Loader - A Modding Tool for The Legend of Zelda: Breath of the Wild (WiiU)

Updates

v3.4.6 16hr
  • Addition Adds new setting to optionally automatically export merged mods to a custom folder
  • BugFix Fixes `patch_file` error when making BNPs
v3.4.5 24hr BugFix3 Feature Addition Removal v3.4.2 16d BugFix v3.4.1 18d BugFix v3.4.0 18d Addition3 Improvement Amendment Tweak Removal2 Refactor BugFix

A mod merger and manager for BOTW

1. A Mod Loader?

Why a mod loader for BOTW? Installing a mod is usually easy enough once you have a homebrewed console or a emulator. Is there a need for a special tool?

Yes. As soon as you start trying to install multiple mods, you will find complications. The BOTW game ROM is fundamentally structured for performance and storage use on a family console, without any support for modification. As such, files like the resource size table or TitleBG.pack will almost inevtiably begin to clash once you have more than a mod or two. Symptoms can include mods simply taking no effect, odd bugs, actors that don't load, hanging on the load screen, or complete crashing. BCML exists to resolve this problem. It identifies, isolates, and merges the changes made by each mod into a single modpack that just works.

2. Prerequisites

  • Windows 10 (7-8 might work but are not supported) or basically any modern Linux distribution
  • A legal, unpacked game dump of The Legend of Zelda: Breath of the Wild for Wii U (version 1.5.0)
  • The latest x64 Visual C++ redistributable

3. Setup

There are two primary options for installing BCML. 

The best way is to install BCML from PyPI. For help with this, consult the video tutorial at the top of this page.

  1. Make sure you already have the latest x64 Visual C++ installed.
  2. Install Python 3.7 or 3.8 (64 bit), making sure to checl Add Python to PATH.
  3. Install BCML using pip in a Command Prompt: pip install bcml
  4. Run BCML using the command bcml or by making a shortcut to bcml.exe, which is located in Python's Scripts folder.
You can also install from source.

On first use, you will have to point BCML to the directories containing your unpacked base game and DLC files. The first run wizard will try to guide you.

4. Usage and Troubleshooting

For information on how to use BCML, watch the intro video above, see the Help dialog in-app, or read the documentation on the repo. For issues and troubleshooting, please check the in-app help and the official Troubleshooting page before commenting.

Requirements

Dependencies and prerequisites required to use this Tool

  1. Windows 10 or modern Linux distro
  2. Unpacked game dump of BOTW
  3. Latest Visual C++ redistributable for x64
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Homepage
github.com
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