# How to Install a Modpack on the ATLauncher

> Install and play a modpack with the ATLauncher, then join a Beacon server running the same pack.

Source: https://www.beaconhosting.org/knowledgebase/how-to-install-a-modpack-on-the-atlauncher
Category: Minecraft
Last updated: 2026-11-05

## Install the modpack

1. Download and install [ATLauncher](https://atlauncher.com), then add your Microsoft account under **Accounts**.
2. Click **Packs** in the right-hand menu.
3. Search for the modpack. Switch between the ATLauncher, CurseForge, Modrinth, FTB and Technic tabs to search those platforms.
4. Click **New Instance**, pick a version, and click **Install**.
5. Go to **Instances** and click **Play**.

The first launch takes a while as the launcher downloads the mods.

> [!TIP]
> Modpacks need more memory than vanilla Minecraft. If the game freezes on loading, give it more RAM in the launcher's settings: see [How to Allocate More RAM on Modded Minecraft Launchers](/knowledgebase/how-to-allocate-more-ram-on-modded-minecraft-launchers).

## Playing it on your Beacon server

Everyone needs the **same modpack and version** as the server. To put the pack on your server:

1. Open your server and go to **Package Manager**.
2. Click **Browse packages**, filter to modpacks, and search for the pack.
3. Pick the **same version** you installed in your launcher and click **Install**.
4. Restart the server from **Console**.

Package Manager installs the server pack, the right mod loader and the right Java version for you.

## Join the server

1. Copy the server address from the **Network** page in the panel.
2. Launch the modpack, click **Multiplayer**, then **Add Server**.
3. Paste the address and join.

If you see a "mod mismatch" or "missing mods" message, the versions don't match. Check the modpack version in both the launcher and **Package Manager**.