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About this mod

Next generation mod manager for the Mass Effect Trilogy and Mass Effect Legendary Edition

Permissions and credits
ME3Tweaks Mod Manager is a mod manager that supports all three Mass Effect trilogy games, as well as all three legendary versions of the games, plus the Legendary Edition launcher. This program is designed to make it easier to install mods for the Mass Effect series for end users. It has tools for developers, as well as advanced game diagnostic features that can be used to troubleshoot both the program itself and games.

ME3Tweaks Mod Manager is also known as M3.

How to install a mod
  • Make a game backup before you install any mods (in the Backup menu item)
  • Drag and drop your mod download onto the interface (or use Download with Manager feature on NexusMods)
  • Click Import to import the mod into the library (this allows update detection for opted-in mods and other features)
  • Select the mod and click Apply
You don't need to run the game through Mod Manager. But for Legendary Edition games, you can turn on the autoboot option in the settings to automatically boot the selected game when launching it from Mod Manager.

How to remove a mod or restore the game
If you made a game backup:
  • You can restore granularly (enable/disable/delete DLC mods, restore specific files) by clicking 'Manage Target'. Note that texture modded games will have limitations on restoration due to how texture modding modifies the game.
  • You can mirror your backup onto your game by using the Restore menu item at the top of the main window. This will make your game match your backup directory. 

Manually copying your game backup will likely result in Mod Manager not recognizing your game, as it has a 'cmm_vanilla' file that is used to force Mod Manager to reject it as a modding target.
If you didn't make a game backup:
  • Unfortunately your only option to reliably reset the game is to nuke the whole game directory and redownload it from Origin, Steam, or DVD. Repairing will not work as it does not remove extra files added by various mods.

Note that texture mods cannot be 'uninstalled', simply due to how the game engine works.
Mod installation order

Mods need to be installed in a specific order in order to properly work

1. Content mods
- Mod Manager installs nearly all of these.
2. Textures (installed with Mass Effect Modder) - These must be installed after all content mods or the texture map will become desynced. You will find it is quite a hassle to reset everything if this step is done out of order.

Content mods should NOT be installed after textures. Mod Manager will not allow install of mods after textures are installed on Original Trilogy versions of games due to empty mips. A lot of things will break if you do this.

Tools for mod developers
Mod Manager includes many tools for developers, accessible by turning on developer mode in the settings. This includes things like DLC mod Starter Kit, mod deployment to 7z (with a whole suite of mod checks), access to many developer tools right in the Tools menu, and more.

Supported operating systems include:
- Windows 8.1 (OT games only)
- Windows 10

Older operating systems are NOT supported. If it works for you, great, if it has issues, you'll have to find your own solutions, I don't work on unsupported operating systems.

Disk space requirements vary based on how much you backup and what mods are installed. A game backup will take up as much space as the game (but can also take less).

Internet connection is required for dynamic features such as the Third Party Importing Service. While an internet connection is not required after the first boot, some features will not work as well without a connection to ME3Tweaks or GitHub.

Support for ME3Tweaks Mod Manager and other ME3Tweak services and products are handled in the ME3Tweaks Discord.

Is your game(s) pirated?
I don't support users who pirate their games. People spent years of their lives making these games, the least you can do is pay for the software they developed. If you have issues with your pirated game don't bother commenting or asking for help because you won't find any.

Is your game cracked but "you bought the game"?
Still not supported. I do not and will not support unofficial copies of any of the games.

Legendary Explorer Core
Almost all package handling code is based on Legendary Explorer Core, the main modding library for the scene. I'd like to single out SirCxyrtyx and Kinkojiro for their hard work in recent years on helping make it better for everyone.

For developing lzma, lzo and zlib wrapper for fast decompression and compression of data, for code used for textures checking from Mass Effect Modder C#.

ME3Tweaks Mod Manager is open source under GPLv3 on the ME3Tweaks GitHub.

Thanks for using my software. It means a lot that I can create tools for others to use.

If you want to donate to help development, you can view the donations item in the Help menu.