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Packs Mod
The Flan's Mod Ultimate Packs mod is an optional companion mod for Flan's Mod Ultimate 2.0. It installs the bundled content packs for you by copying them into the content-pack folder used by the main mod.
Use this page if you installed a second mod file named like "Flan's Mod Ultimate
Packs" or flansmodultimate_packs and want to understand what it does.
On startup, the Packs mod:
- finds the content-pack folder used by Flan's Mod Ultimate;
- extracts the bundled packs into that folder when they are not already installed;
- writes a small hidden marker file so it knows which Packs mod version was used;
- protects existing non-empty folders by moving them to a backup folder when needed.
The Packs mod does not replace the main Flan's Mod Ultimate mod. It only provides ready-to-use content packs for it.
Install both mods in your mods folder:
mods/
Flan's Mod Ultimate 2.0.jar
Flan's Mod Ultimate Packs.jar
Start the game or server once. The Packs mod will create or update the content-pack folder during startup. After that, the main mod loads the extracted packs like normal content packs.
For multiplayer, install the Packs mod on the server and on every client that joins the server. This keeps gameplay content, models, textures, and sounds matched.
By default, packs are extracted to:
.minecraft/flan/
If you changed the content-pack path in config/flansmodultimate-content-loading.toml,
the Packs mod uses that same path. This means the automatic extraction follows the
same folder that the main mod reads from.
For more information about content loading settings, see Mod Config.
If the content-pack folder does not exist, the Packs mod creates it.
If the folder exists but is empty, the Packs mod extracts the bundled packs into it.
If the folder already contains packs and no Packs mod marker is present, the Packs mod assumes the folder may contain user-managed content. It moves the existing folder to a backup first, then creates a fresh folder for the bundled packs.
The backup is named like:
flan_backup_2026-06-11_18-30-00
When you install a different version of the Packs mod, it checks the marker file in the content-pack folder.
If the folder contains packs from another Packs mod version, the old folder is moved to a versioned backup before the new bundled packs are extracted.
The backup is named like:
flan_backup_1.0-beta-3_2026-06-11_18-30-00
This prevents older extracted packs from being mixed with newer ones.
If the folder already has the marker for the current Packs mod version, extraction is skipped. This avoids rewriting the same packs every time the game starts.
If you want the Packs mod to install a clean copy again, remove or rename the current content-pack folder before starting the game. Keep a backup if you made manual edits.
Backup folders are created next to the normal content-pack folder. They are not loaded by the mod unless you manually move or copy content from them back into the active content-pack folder.
Use backups to recover manually installed packs or compare what changed after a Packs mod update.
You can still install your own content packs manually. Put them in the content-pack folder used by the main mod.
If you also use the Packs mod, avoid editing the extracted bundled packs directly. For balance changes, prefer the Category System. For individual content-pack parameters, see Config Reference.
Check that the Packs mod is installed in the mods folder together with the main
mod, then restart the game or server.
Also check whether you changed the content-pack path in
config/flansmodultimate-content-loading.toml. The packs may have been extracted to
that custom folder instead of .minecraft/flan/.
Look for a folder named flan_backup_... next to the active content-pack folder. The
Packs mod moves old or unmarked non-empty folders there instead of deleting them.
Make sure the same Flan's Mod Ultimate version, Packs mod version, and content packs are installed on the server and on every client.