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Decky-Nexus: Install Nexus Mods on Steam Deck Without Desktop Mode

2026-08-22 · News and analysis

Affiliate disclosure: This guide contains affiliate links. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you. Learn more.

Modding on a Steam Deck has always meant the same detour. Drop to Desktop Mode, wrestle with a mod manager built for a mouse, install what you want, then switch back. It works, but nobody enjoys it.

A new unofficial Decky Loader plugin called Decky-Nexus removes that detour. You browse Nexus Mods, download, install and manage them from Gaming Mode, on the controller, without ever leaving the Steam interface.

It is genuinely good. It also has two catches that we are going to put right at the top rather than at the bottom.

The Two Catches

You need a Nexus Mods Premium account. This is not a soft requirement. Nexus does not let free accounts generate download links through its API, so the plugin cannot fetch files for you without Premium. If you do not have it, the plugin will install and then be unable to download anything.

Installing it is not one click. There is no entry in the Decky store yet. Setup means dropping to Desktop Mode once, running a shell command, and pasting in a personal API key. After that you never touch Desktop Mode again, but that first pass is unavoidable.

If both of those are fine with you, the rest of this is good news.

What It Actually Does

The plugin lives in Decky Loader's Quick Access Menu, the same panel that holds PowerTools and the rest of your plugins. It is not a separate app.

With a supported game selected in your library or running in the foreground, it can:

Browse that game's Nexus Mods listings, with search and sort
Download and install mods directly
Run FOMOD installer wizards, laid out for a controller rather than a mouse
Install Nexus collections with load ordering handled automatically
Show what you have installed and what has updates waiting
Enable and disable individual mods, or reset a game back to vanilla
Run health checks by reading the game's own logs
Pick a specific version when updating rather than always taking the newest
Endorse mods and reach author support links

The collection support with automatic load ordering is the standout. Load order is the part of modding that most often breaks a setup, and handling it on a controller would be miserable otherwise.

Which Games Are Supported

This is not blanket Nexus support. The plugin handles a specific list, and each game on it got individual work.

Currently supported:

Cyberpunk 2077
Elden Ring
Fallout 4
Fallout: New Vegas
Helldivers 2
Mount & Blade II: Bannerlord
Resident Evil 4
Skyrim Special Edition
Slay the Spire 2
Stardew Valley
The Witcher 3
Star Wars Battlefront II

The developer says each of these was installed, modded and played on real hardware before shipping. Star Wars Battlefront II reportedly needed a custom compiler built for Frostbite's file format, which gives you a sense of why the list is short rather than universal.

The game also needs to be installed through Steam for the plugin to find it.

Setting It Up

You need Decky Loader installed first. If you do not have it, our Bazzite setup guide covers Decky installation, and it works the same way on stock SteamOS.

Step 1: Get your Nexus API key.

Log in to Nexus Mods on any browser. Click your profile picture in the top right, go to Site preferences, then API Keys in the left menu. Scroll to the very bottom and copy the Personal API Key.

Do this part on a real computer if you can. Copying a long key on the Deck's touchscreen keyboard is not fun.

Step 2: Drop to Desktop Mode and install the plugin.

Open a terminal and run the install script from the project's repository. It fetches the plugin and drops it where Decky expects it.

You will be asked for your API key during setup. The plugin saves it, so this is the only time you type it. That is deliberate, because typing an API key on a controller once is bad enough.

Step 3: Back to Gaming Mode.

Decky-Nexus appears in your Quick Access Menu alongside your other plugins. Select a supported game and the plugin picks it up from there.

Automatic updates through the Decky store are not available yet, so updating means repeating the install step when a new version lands.

Before You Mod Anything

Some plain advice, because this plugin makes modding easy enough that people will do it carelessly.

Back up your saves first. This is software that modifies game files. It is a beta. Both of those are reasons to have a copy of your saves somewhere else before you start. Our save backup guide covers the process.

It is unofficial. Decky-Nexus is not a Nexus Mods product and not a Valve product. Neither of them supports it. If something breaks, the community is your support channel.

It is labelled 1.0 beta. The developer describes it as fully functional while being upfront that it is community built and unsupported. Expect rough edges.

Mods can break Proton compatibility. A game that ran fine before can stop launching after a mod. The reset to vanilla option exists for exactly this reason, and it is worth knowing where it is before you need it.

Does This Work on Other Handhelds

Partly, and it depends on what you are running.

Steam Deck on SteamOS. Yes. This is the target platform.

Third party handhelds running SteamOS or Bazzite. Yes, in principle. Decky Loader runs on both, so the plugin should too. Our SteamOS vs Bazzite vs Windows comparison covers which handhelds run what, and installing SteamOS on third party handhelds covers getting there.

Windows handhelds like the ROG Ally X or Legion Go. No. Decky Loader is a SteamOS Gaming Mode component and does not exist on Windows. Use a normal desktop mod manager instead.

Android handhelds. No. Decky does not exist on Android at all.

Check Steam Deck OLED Price on Amazon

Why This Matters

Steam Deck modding has been possible for years. What it has not been is comfortable.

The Desktop Mode round trip is a real barrier, and not just a cosmetic one. It means modding is something you plan a session around rather than something you do casually while playing. Moving it into Gaming Mode changes the character of it. Seeing a mod, installing it and being back in the game two minutes later is a different experience than the alternative.

That is the thing worth paying attention to here, more than any single feature. The Premium requirement will put some people off, and fairly. But this is the first time managing Nexus mods on a Deck has felt like it belongs on the device rather than on the desktop underneath it.

Frequently Asked Questions

What is Decky-Nexus?

An unofficial Decky Loader plugin for Steam Deck that lets you browse, download, install and manage Nexus Mods from Gaming Mode using a controller, without dropping to Desktop Mode. It is community built and currently labelled a 1.0 beta.

Do I need Nexus Mods Premium to use Decky-Nexus?

Yes. Free Nexus accounts cannot generate download links through the Nexus API, so the plugin cannot fetch mod files without a Premium account. This is a hard requirement, not an optional upgrade.

How do I install Decky-Nexus?

You need Decky Loader first. Then drop to Desktop Mode once, run the project's install script from a terminal, and paste in your Nexus personal API key when prompted. After that the plugin lives in your Quick Access Menu and you never need Desktop Mode again.

Where do I find my Nexus Mods API key?

Log in to Nexus Mods, click your profile picture in the top right, go to Site preferences, then API Keys in the left menu. Your Personal API Key is at the bottom of that page.

Which games does Decky-Nexus support?

Around twelve games at launch, including Cyberpunk 2077, Elden Ring, Fallout 4, Fallout: New Vegas, Helldivers 2, Mount & Blade II: Bannerlord, Resident Evil 4, Skyrim Special Edition, Slay the Spire 2, Stardew Valley, The Witcher 3 and Star Wars Battlefront II. The game must be installed through Steam.

Is Decky-Nexus safe to use?

It is a community project rather than an official Nexus Mods or Valve product, and it modifies game files. Back up your saves before using it. It also handles your Nexus API key, so install it from the official repository rather than a mirror.

Can I use Decky-Nexus on a ROG Ally or Legion Go?

Only if the device is running SteamOS or Bazzite. Decky Loader is a SteamOS Gaming Mode component and does not exist on Windows, so a Windows handheld needs a conventional desktop mod manager instead.

Will it break my game?

It can. Mods change game files and a modded game can stop launching under Proton. The plugin includes a reset to vanilla option for exactly this situation, and the health check feature reads game logs to help diagnose problems.