Installing and Migrating

This page discusses how to install the modpack using Technic or MultiMC, and how to migrate the modpack from one installation type to another in SP. See Server Setup for how to setup a server for MP.

= Installing =

Technic

 * Download, install and start the Technic launcher
 * Go to the Modpacks tab and enter "GT New Horizons" in the search box. Make sure the pack named "GT New Horizons" is selected in the results list.
 * Optionally click the Modpack settings link in the upper right to select a specific version and/or install path. By default, the latest recommended release will be installed, but some servers may use other versions.
 * Click the Install button on the lower right to install the pack.
 * Before launching the game, you may need to adjust your Java settings. Go to the Launcher settings at the top right corner, and the Java tab of that dialog. At least 4 GB is recommended. Make sure you are using an up to date, 64-bit Java 8 (!) version.
 * Click Play to start the game.

MultiMC
GTNH can easily be installed on MultiMC by adding a new instance and importing the ZIP archive available from http://downloads.gtnewhorizons.com/Multi_mc_downloads/.

Note that the above only applies to stable releases (eg 2.1.X.0). If you would like to install a new dev release, you must first install a stable release, then follow the steps in XYZ to upgrade to the dev release. For old dev builds only (like versions prior to 2.0.8.3), you will need to prepare a vanilla instance and install Forge.
 * First download MultiMC. It will be a simple zip file, so you will want to unpack it in your HD someplace - with new versions of Windows, your Documents folder may be backed up via OneDrive, so you might want to/not want to install there.
 * Next, go to Add Instance and choose 1.7.10 in the Vanilla tab. Give the instance a meaningful name.
 * Select your new instance and click Edit Instance. There click Install Forge in the Version tab. The required Forge version is 10.13.4.1614 (which is the latest and should be the top entry in the list).
 * Now you need to get the modpack files. These are easiest to get from http://downloads.gtnewhorizons.com/ClientPacks. Make sure to download the correct version.
 * In the zip archive you will find a  folder, that contains all the important files. You will need to copy its contents to the   folder of your MMC instance. You can jump to the appropriate folder from within MMC by selecting the instance and clicking the Minecraft Folder button on the right.
 * If you feel fancy, you can also grab the modpack logo  from the zip file. Then go to MMC, right click your instance, choose Change icon and use the Add Icon button.
 * If you are playing locally, backup the,   tracker, and   directories.
 * If you are playing remotely, you still need to backup the  and   tracker directories.

Curseforge Launcher
Not recommended at this time due to their new license requirements on mods. And the fact that it constantly messes up recipes and is generally out-of-date. Please choose a different option.

= Upgrading =

Technic
Recommended releases are pushed to Technic at a slower rate, once they have completed testing. Sometimes releases can be pushed to Technic for testing, to see those look in the Technic configuration window.

MultiMC

 * 1) Assuming you have storage, first backup your existing GTNH instance with right click -> Copy Instance. (If you don't have a GTNH instance yet, refer to Installing above.) This will help make sure you still have access to settings / configs for reference, and don't lose your screenshots, keybinds, etc.
 * 2) Delete the ,  ,   and   folders from your     folder.
 * 3) Copy in the folders with the same names from the downloaded archive.
 * 4) Port over any customized config settings (this is where your backup comes in handy for reference).
 * 5) Update your questbook. You can either use the default load block, go to cheat mode and do   to load quest book changes, or do   on a server.

= Migrating to a different installer = This guide will go over migrating your installation to a new launcher.

Files to backup

 * 1) If playing in single-player, backup your  folder.
 * 2) The   folder - if you use a different map/waypoint tool find its data.
 * 3) The  folder.
 * 4) The  folder
 * 5) Any custom resources/resourcepacks you are using.
 * 6)   (also   if you use optifine).
 * 7) Your   folder, if you want to keep them
 * 8) Any custom (client-side or not) mods such as InGameInfoXML and its configuration file.
 * 9) Your backups in the   folder (feel free to only grab 1 or 2 if you aren't deleting it)
 * 10) Any custom changes to the config files or script files
 * 11) Consider keeping the logs folder if you crash a lot