How to Download Subnautica Mods | Setup for BepInEx & Manager

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Download Subnautica mods from Nexus Mods, install BepInEx, then place the files into BepInEx\plugins manually or with the built-in Manager.

How to download Subnautica mods breaks down into two reliable routes — a built-in Mod Manager for the simplest experience, or a manual install into the BepInEx\plugins folder for full control. Both start the same way: install BepInEx and launch Subnautica once. The table below compares the two methods, and the steps that follow walk you through both from start to finish.

Where Do You Get Subnautica Mods?

Two sites host nearly every Subnautica mod worth installing. Nexus Mods has hundreds of community-uploaded mods with file descriptions, dependency notes, and version tracking. Thunderstore organizes mods by game and offers a desktop app that handles updates and installations automatically. Both are free to browse and download from.

Each mod page tells you which framework the mod needs — BepInEx, QMods, or none — and where its files should go. Ignoring those instructions is the most common cause of a mod that does not load.

What Is BepInEx and Do You Need It?

BepInEx is the mod-loading framework that most Subnautica mods depend on. Yes, you need it. Without BepInEx, the mod files inside the plugins folder have no code loader to activate them, so the game launches as if nothing was added.

To install BepInEx, download the latest Subnautica pack from Nexus Mods or Submodica and extract the copied files directly into your Subnautica folder (usually Steam\steamapps\common\Subnautica). Launch Subnautica once, then close it. That first run creates the BepInEx\plugins folder and the rest of the loader structure you need for the next step.

Installing Subnautica Mods: The Step Order That Works

Subnautica mods install into the BepInEx\plugins folder after BepInEx is set up. Some mods include a built-in Mod Manager that lets you drag the ZIP into a special folder and click a single button. Each method covers almost every mod on Nexus and Thunderstore.

Method 1 — Using the Built-in Mod Manager

  • Download the mod ZIP from the mod page. Do not extract it.
  • Open Subnautica and look for a Mod Manager button on the main menu. If it is not there, the mod does not support this method — use Method 2 instead.
  • Drag the ZIP file into the Mod Downloads folder that appears inside the manager, or place it in Subnautica\BepInEx\plugins\SubnauticaModManager\Mod Downloads.
  • Click Install all mods in the manager window. The mod loads the next time you start the game.

Method 2 — Manual Install

  • Download the mod ZIP and extract it using 7-Zip or WinRAR.
  • Copy the extracted folder (often named after the mod) into Subnautica\BepInEx\plugins. If the folder does not exist, launch Subnautica once to generate it, then close the game and copy the files.
  • Launch Subnautica. The mod is active if you see its effects in-game or a new entry in the main menu.

The Subnautica Mod Manager mod page on Nexus Mods shows the complete download and setup flow for mods that use the built-in manager.

Step or Detail Mod Manager Method Manual Install
Download source Nexus Mods or Thunderstore Nexus Mods or Thunderstore
Framework needed BepInEx installed first BepInEx installed first
Initial setup Launch game once to generate folders Launch game once to generate folders
File state Keep ZIP compressed Extract ZIP with 7-Zip or WinRAR
Target folder Mod Downloads folder (auto-created) BepInEx\plugins
Install action Click “Install all mods” button Drag extracted folder into plugins
Supported mods Only mods with a built-in Manager All BepInEx-based mods

Most mods on Nexus Mods use the manual install path because not every mod author includes the Manager tool. When in doubt, extract to BepInEx\plugins — it works for every mod that runs on BepInEx.

Common Mistakes That Break Mods

Almost every broken mod installation traces back to a small set of easily avoided errors. The table below covers the seven most frequent problems and their fixes.

Mistake Symptom Fix
BepInEx not installed Mod files do nothing after launch Install BepInEx framework before adding mods
Files in wrong folder Mod does not load Move the mod folder into BepInEx\plugins
Did not launch game once Plugin folder missing from Subnautica folder Launch Subnautica, close it, check again
Missing dependencies Mod loads but crashes the game Install all required companion mods listed on the mod page
Used wrong game version Mod incompatible with your game build Download the version matching your copy (Subnautica vs Below Zero vs Subnautica 2)
ZIP not extracted (manual method) Manager does not see the mod Extract ZIP before moving files into plugins
Manager does not appear No Mod Manager button on main menu Install manually to BepInEx\plugins instead

One rule prevents most of these issues: read the mod page’s install instructions before downloading. Each mod tells you which loader it needs, which folder it goes into, and any other mods it requires.

From Download to Playing: The Complete Sequence

Here is the sequence that works for almost every Subnautica mod on Nexus Mods and Thunderstore:

  1. Install BepInEx — download the pack, extract into the Subnautica folder, launch once, close.
  2. Download the mod ZIP from its page.
  3. If the mod page mentions a built-in Manager — drag the ZIP into the Mod Downloads folder and click Install all mods.
  4. If it does not — extract the ZIP and copy the folder into BepInEx\plugins.
  5. Launch Subnautica. The mod is working when you see its features or a new menu entry.

For Subnautica: Below Zero, check whether the mod page asks for QMods instead of BepInEx — a small number of older Below Zero mods use that loader. For the original Subnautica, BepInEx is the standard. Subnautica 2 may use a different structure entirely, so read its mod pages carefully.

References & Sources