TODO: Add a section on installing the resources (sounds) folder to the MCP environment. The links have changed and Minecraft 1.2.5 isn't able to download them anymore.
Make sure to always have a backup copy of all of these downloaded files! I'd recommend putting them into a seperate folder from your MCP / Forge project directory.
- Forge: Download the Forge 1.2.5 source distribution you'd like to use (it's recommended to use the latest released version). These can be found on the official Forge website.
- MCP: Download the Mod Coder Pack for 1.2.5 (mcp62). The Minecraft wiki has a list of MCP versions with download links here.