Installer
Installer.exe
Windows installer · 1.05 MB
WINDOWS SPLIT-SCREEN HUB
Nucleus Co-op Download
Download Nucleus Co-op for Windows, find the right handler for your game, and learn how to launch supported PC games in local split-screen. This independent guide keeps the release link, setup steps, controller notes, and common fixes in one place. Use this Nucleus Co-op download guide to confirm the file and version before you begin.
Verified release assets · checked August 8, 2026
GET THE FILES
Nucleus Co-op Download from the verified release
The homepage download buttons point to the release assets listed by the Nucleus Co-op project. Choose the installer for the simplest setup, or choose the portable ZIP when you want to extract the app yourself. The version and file facts below are recorded from the release check shown above; re-check the official source whenever a newer release is published.
Before you launch
- .NET Framework 4.7.2 or newer
- Visual C++ Redistributable 2015–2019 for x86 and x64
- WebView2 may be needed if the built-in downloader hangs
ZIP archive: The ZIP archive uses the password nucleus when the official release asks for one.
Official source: Only download executable files from a source you trust. This site does not repackage the application or promise that every antivirus alert is harmless.
CHOOSE YOUR NEXT STEP
What do you need help with?
Nucleus Co-op searches are usually task-driven. Some visitors need the download immediately; others already have the app and need a handler, a controller fix, or a reliable supported-games list. Use the route that matches your problem instead of guessing at random launch settings.
Install Nucleus Co-op
Follow a clean Windows setup from the first download to your first split-screen launch.
Open install guideFind your game
Browse the Nucleus Co-op games list, read handler notes, and check game-specific setup requirements.
Browse gamesInstall a handler
Understand what a handler does, where it belongs, and why handler versions can affect compatibility.
Read handler guideFix a launch problem
Start with offline mode, OneDrive, access denied, input, ProtoInput, and resolution fixes.
View troubleshooting
HOW IT WORKS
From download to local co-op
Nucleus Co-op is not a universal multiplayer patch. It is a Windows launcher and handler system that can help create multiple local game instances when the game and its handler support the required launch and connection behavior.
Install the app
Extract or install Nucleus Co-op in a simple folder that you can access. Avoid protected or cloud-synced locations while troubleshooting.
Choose a handler
A handler contains game-specific launch instructions. Select the handler that matches the game, version, and community notes you are following.
Assign inputs
Connect controllers or keyboards, then confirm that each input is assigned to the intended game instance before launching.
Launch and connect
Start the instances, arrange the windows, and use the game's supported LAN, online, or mod connection method when required.
GAME DISCOVERY
View the full games list
Popular Nucleus Co-op game searches
Compatibility changes with handlers, game builds, mods, and controller behavior. These cards are entry points for the game names that appear most often in this site's keyword research; always read the current handler notes before installing a game-specific setup.
Game-specific guide
Risk of Rain 2
A high-interest Nucleus Co-op search with game-specific launch and input questions.
Open game guideGame-specific guide
Call of Duty: Black Ops II
Common searches include handler setup, startup crashes, and controller input separation.
Open game guideGame-specific guide
Minecraft Java
A frequent split-screen query with keyboard, controller, and instance input questions.
Open game guideGame-specific guide
Palworld
Check the current handler notes and PC version requirements before setting up multiple instances.
Open game guideCheck current handler notes
Elden Ring Nightreign
Search demand focuses on handler availability, save behavior, and version-specific limitations.
Check game listCheck current handler notes
Vampire Survivors
A popular local co-op search where the correct version and handler details matter.
Check game list
COMMON PROBLEMS
Start here when Nucleus Co-op is not working
Most launch failures are caused by a mismatch between the game version, handler, install path, permissions, input method, or the way a particular game connects its instances. The fixes hub helps you identify the failure category before you change several settings at once.
Handler download stuckCheck the built-in downloader, WebView2 requirement, firewall behavior, and manual handler installation steps.
Offline or no networkLearn when Nucleus Co-op needs an internet connection and when the game itself needs LAN or online connectivity.
Controller input is mixedSeparate XInput, DirectInput, PS4, PS5, Joy-Con, keyboard, and mouse assignments before testing a new handler.
Access denied or OneDriveMove the app and working files to a simple local path, then review permissions and folder synchronization conflicts.
THE SHORT VERSION
What is Nucleus Co-op?
Nucleus Co-op is a Windows utility for local split-screen play in supported PC games. Instead of pretending that every game works the same way, it uses game-specific handlers to describe how instances should launch, where windows should appear, and how input devices should be separated. That is why the same setting can work perfectly in one game and fail in another.
The most useful way to use Nucleus Co-op is to treat the handler and the game version as a pair. Start with the current game entry, read its notes, install the required dependencies, and test one small change at a time. If a page says that a feature depends on a handler, mod, LAN mode, or particular controller path, that dependency matters more than a generic claim that the application supports split-screen.
This site is an independent English resource. It links to the official release source, documents repeatable setup steps, and separates confirmed release facts from community troubleshooting advice. It does not host cracked games, bypass ownership checks, or claim affiliation with the Nucleus Co-op developers.
NUCLEUS CO-OP
- Use the official release asset for the application itself.
- Treat handlers as game-specific instructions, not universal plug-ins.
- Use legitimate game installations and follow each game's own connection requirements.
- Record the game version, handler version, controller type, and error message when asking for help.
Practical notes for a stable setup
Practical notes for a stable setup
SETUP FACTS
What to check before you download
A clean download page should answer the practical questions before it asks you to troubleshoot. Nucleus Co-op is a Windows application, the release assets have different sizes and formats, and the portable ZIP is not the same thing as the source-code archive. Keep those details visible so visitors do not download the wrong file or assume that a handler is part of the main installer.
The version shown on this page is a checked release fact, not a permanent promise. Software releases can change after publication. When the official repository publishes a newer release, update the version, file links, prerequisites, schema, and installation notes together.
| Check | Why it matters |
|---|---|
| Windows desktop | Nucleus Co-op is designed for Windows PC workflows; console or mobile instructions do not apply. |
| Game ownership | The application does not replace the game. Use a legitimate installation that the handler can find. |
| Handler match | A handler may depend on a particular game build, mod, launcher, or connection method. |
| Input separation | Two visible windows do not guarantee two independent controllers; verify the mapping before a long session. |
| Local install path | Cloud-sync folders, protected directories, and unusual permissions can create avoidable launch errors. |
QUICK ANSWERS
View the full FAQ
Nucleus Co-op FAQ
These answers cover the highest-intent questions in the current keyword set. Use the linked guides when the short answer points to a version, handler, or controller-specific detail.
Is Nucleus Co-op safe to download?
Use the official release source linked on the download page and treat executable files carefully. Nucleus Co-op can interact with game processes and input devices, so this site avoids absolute safety guarantees and does not recommend random mirrors.
Does Nucleus Co-op work online?
Nucleus Co-op is primarily used for local split-screen instance workflows. Whether a game can connect the instances through LAN, online mode, or a mod depends on the game and its handler; Nucleus Co-op itself does not turn every single-player game into online multiplayer.
Does Nucleus Co-op need Wi-Fi?
The application may work offline for some tasks, but the game or handler can still need an internet connection, LAN discovery, a local network, or an online service. Check the game-specific guide rather than assuming one rule applies to every title.
Can I use multiple controllers?
Many setups use multiple controllers, but the exact behavior depends on the controller type, input API, handler, and game. If one controller moves more than one instance, use the controller troubleshooting guide before changing the game files.
Does Nucleus Co-op support every PC game?
No. Supported games depend on available handlers and the technical behavior of each game. A game can appear in a community list and still require a specific build, mod, launcher, or workaround.
Where should I install Nucleus Co-op?
Use a simple local folder that you can read and write, and avoid OneDrive-synchronized or heavily protected paths while setting up the application. The install guide explains the cleanest first test.
Start your Nucleus Co-op download and check your game
Use the verified installer, then open the install guide before you add a handler. If you already know the game you want to play, start from the games list so your setup matches the current handler notes.
Open the download page