This tutorial will show you how to copy a modified Minecraft instance from the Twitch/Curse client to MultiMC.



Now why would I want to do that, some may ask. I believe that there are a variety of reasons to play using MultiMC instead:

You simply don’t like the Twitch client and don’t need the streaming features

You want to play a modpack with the Steam Controller

You want to allocate different amounts of RAM to each of your Minecraft instances

You want easy access to your singleplayer worlds and world seeds

You want a better overview over your screenshots

You want to easily create and export your custom mod packs to give them to your friends

You want a better console to analyze Minecraft client crashes

Etc etc …

Sadly, simply copying an entire folder from Twitch to MultiMC won’t work. This guide will help you with that.

1) First, open your Twitch launcher, then pick and choose the Modpack you would like to copy over to MultiMC. We will be using the Regrowth pack as an example.

2) Click on the “Play” button of that instance, which will open the Minecraft Launcher.

3) Click on “Play” in the Minecraft launcher in order to have the client download all game assets. Once the game has properly started, exit it. In the Twitch launcher, click on the image icon of the modpack (“View Profile”) to see its details – we need to know the Minecraft version and Forge version later.

4) Leave this window open, then start MultiMC. Click the button at the top left to add a new instance.

5) In the menu that opens, you can click the icon (1) to set a different icon for your instance. Enter the desired name for the modpack in field (2), then click button (3) to choose the Minecraft version.

6) Choose the Minecraft version (1) that is identical with the version indicated on the modpack detail page in your Twitch client and confirm with OK (2).

7) Click on the new instance (1) you just created and launch it (2). This will download the requried game assets. Wait until the game finishes downloading all assets and close it once you are in the main menu.

8) Click on “Edit Instance” (1).

9) Click on the “Version” tab (1) in the window that opens.

10) Click on “Install Forge” (1).

11) Choose exactly the same Forge version as indicated on the Twitch modpack page. If you pick the wrong version, your game may not launch properly.

12) Launch the game from MultiMC, then close it again.

13) Go to your Twitch Client. Click on Button (1), then on “Open Folder” (2) to access the folder folder of the modpack.

14) Mark all files and subfolders in that directory and copy everything.

15) In MultiMC, select your instance and click on “Instance Folder” (1).

16) Open the “minecraft” folder in that directory and paste the previously copied files and folders in here. If you get an “overwrite” prompt, confirm that with “yes”.

17) In the MultiMC main window, leftclick your instance once, then click on “Edit Instance”. In the window that opens, click on “Settings” (1).

18) Check the box at “Memory” (2), then adjust the minimum and maximum memory allocation values (3). Most modpacks should run just fine with min-max values of 1024 – 4096 MB RAM, but your experience may vary. If loading takes unusually long, or if your game lags considerably, you may need to allocate more RAM in some cases.

And that’s it, you’re done! You can now launch the modpack from MultiMC. Have fun!