Install a Minecraft modpack

Open Modpacks, pick a version, then create a profile or replace the active one. Pylon stops the server, backs up, and installs the pack onto that profile.

29 Sept 2026·2 min read·PylonHosting

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1. Switch to Forge, Fabric, NeoForge or Quilt 2. Make your own backup if the world matters 3. Open Modpacks and pick a version 4. Create a profile or replace the active one 5. If the install fails

The Modpacks tab only appears on modded loaders. A Paper, Spigot or Purpur server shows Plugins instead. Installing a pack is destructive: Pylon stops the server, saves a backup, deletes the old files, then installs onto a clean server.

1. Switch to Forge, Fabric, NeoForge or Quilt

Open Settings → General. Under Server software, pick Forge, Fabric, NeoForge or Quilt as included with the plan. Changing software creates a backup first, then reinstalls and replaces game files. Worlds convert forward only.

If you only needed plugins on Paper, use the Plugins tab instead of a modpack.

1 Settings, 2 General. Change software here before Modpacks appears.

1 Paper (plugins, no Modpacks tab). 2 Forge. 3 Fabric. Changing software creates a backup first.

2. Make your own backup if the world matters

Software change already creates a backup. Make another restore point from Backups if you want a named copy of the current world. Wait until the row says Complete. Installing a pack deletes old files and folders after that backup step.

1 Check remaining slots. 2 Create backup and wait until Complete before you replace the active profile.

3. Open Modpacks and pick a version

After the loader is Forge, Fabric, NeoForge or Quilt, open the Modpacks tab. Search Modrinth or CurseForge, pick a pack version that matches that loader and a Minecraft version you can run, then continue. You will see live progress while the job runs. There is a limit on how many pack installs you can start per hour.

4. Create a profile or replace the active one

Choose Create profile to keep the current world as its own profile, or Full install to replace only the live profile. Pylon stops the server first, saves a backup, then installs the pack onto that profile. Other saved profiles stay where they are. The finished progress bar stays on this visit only. Opening Modpacks later does not replay an old finished install. Do not close the page to “speed it up”. When it finishes, start the server and wait until the console is done. Players need the matching client modpack. Read how profiles work before you switch away from the new pack.

5. If the install fails

Read the job message on Modpacks, then the Overview console. Missing or unsupported mandatory dependencies means a mod the pack needs is not in /mods — restore the backup from the install, or run the install again. UnsupportedClassVersionError means Java is wrong for that Minecraft version. Set it on Settings → General, then start again. If the pack needs extra RAM, upgrade from billing rather than forcing another wipe.

1 Java version (applies on next start). 2 Game version. Match the pack, then start again.

A missing mod, or Java that is too old for the pack. Restore or fix Java before another wipe.

1
Switch loader
Settings → General → Forge, Fabric, NeoForge or Quilt.
2
Back up
Wait until a backup is Complete if the current files matter.
3
Install the pack
Modpacks tab, pick a version, then create a profile or replace the active one.

Open a support ticket Voice chat

Still stuck?

Match the error, then ask if you still need help

Most console and join issues are already in the guides. Copy the ERRORS line first. Open a ticket only if the steps still fail.

Common errors Open a support ticket