FOR HELP : https://discord.gg/yPf4jnb4yv

https://github.com/dll1230/Apoapsis-one-click-KSP-multiplayer

https://www.youtube.com/watch?v=NGGpTB6PY40

Apoapsis: KSP Multiplayer Launcher

One-click multiplayer for Kerbal Space Program 1. Find a server, get the right mods automatically, and launch straight into a shared universe with your friends. Your normal Steam game is never touched.

Made by Twinforge Studios. Powered by LunaMultiplayer. Public beta.

What is Apoapsis?

Apoapsis is a desktop launcher that makes LunaMultiplayer (LMP) easy. You don't install LMP by hand, match mod lists, or type IPs into an in-game menu. You pick a server and press Launch & Join.

Apoapsis keeps a separate multiplayer copy of KSP next to your normal game. Mods, settings and multiplayer files all live there, so your single-player saves, mods and Steam install stay exactly as they were.

Like FiveM for GTA V, or BeamMP for BeamNG.drive, but for Kerbals

If you've played FiveM or BeamMP, you already know how Apoapsis works:

What this means in practice: before Apoapsis, KSP multiplayer meant installing LunaMultiplayer by hand, comparing GameData folders with your friends, and finding out at the connect screen which mod was missing. Now the server owner picks the mods once, and everyone who joins gets exactly that setup automatically. It's the FiveM and BeamMP experience for KSP.

Apoapsis is not affiliated with FiveM/Cfx.re, Rockstar Games, BeamMP or BeamNG GmbH. The comparison is only to explain how it works.

Features

🚀 Join in one click

• Server browser with hundreds of public LunaMultiplayer servers: player counts, game mode, password, LMP version and ping.
• Quick Play and Join last server from the home screen.
• Auto-join: KSP starts, skips the main menu, and drops you into the server's Space Centre.
• Invite codes: a friend sends you one code, and it contains the address and their mod list.

📦 Server mods installed for you

• Hosts pick mods from CKAN. Players joining get exactly those mods, at exactly those versions, with dependencies included.
• Downloads come only from the mods' official sources and are SHA-256 verified.
• Mods are cached, so switching between servers with different modpacks takes seconds, not a full reinstall.
• Mods that contain plugin code (DLLs) ask for your approval before they are installed.
• You can choose the download folder and set a cache size limit.

🖥️ Host your own server

• Create a LunaMultiplayer server from inside the launcher: no config files, no command line.
• Multiple servers, each with its own universe, mods and settings. They can run at the same time.
• Saves: back up your universe with one click and restore it at any time.
• Duplicate a server to try new mods without risking your world.
• Built-in hosting guide for both playing with friends (Radmin VPN, ZeroTier, Tailscale or port forwarding) and a permanent 24/7 VPS server.
• Optionally list your server publicly so anyone can find it.

🎮 Game settings before you launch

Set resolution, fullscreen, frame-rate limit, V-Sync, UI scale, texture quality, anti-aliasing, effects and volumes in the launcher before loading in. These apply to the multiplayer copy only.

✨ A nicer loading screen

A custom loading screen with real loading progress (percentage and what's loading right now), mod count, connection status and tips, so you know it hasn't frozen while a big modpack loads.

🛡️ Safe by design

• Your original KSP folder is only ever read. Apoapsis can verify it's unchanged after every session (Settings → Original install protection).
• The multiplayer copy runs with limited Windows permissions, so even a misbehaving mod can't write into your original game.
• Server passwords are never saved to disk or written to logs.

Requirements

You do not need to install LunaMultiplayer yourself. Apoapsis downloads the official LMP 0.29.2 release into the multiplayer copy.

Installation

1. Download Apoapsis_0.9.0_x64-setup.exe and run it. Windows may show "Windows protected your PC" because the beta isn't code-signed yet. Click More info → Run anyway.
2. On first start, choose a player name and point Apoapsis at your KSP folder. Steam installs are found automatically.
3. Open Mod Manager and press Set up multiplayer. This creates the multiplayer copy and installs LunaMultiplayer.
4. Go to Servers, pick one, and press Launch & Join.

Uninstalling: use Windows' "Apps & features". Your KSP install was never changed, so there's nothing to clean up there.

Playing with friends

Joining a friend: ask them for their invite code (it starts with apoapsis1:). Paste it into Servers → Direct connect, and Apoapsis installs their mods and connects you.

Hosting for friends: 1. Host a Server → +: name it and set a password. 2. Make sure your friends can reach you. The easiest way is for everyone to join the same Radmin VPN, ZeroTier or Tailscale network. The Hosting guide tab walks you through it, including port forwarding. 3. Press Start, then Invite, and send the code.

FAQ

Will this break my save or my mods? No. Everything multiplayer happens in a separate copy, and your original game folder is only read.

Do my friends need the same mods? Apoapsis handles it. When they join with your invite code, they get exactly your server's mods.

Can I join normal LunaMultiplayer servers? Yes. The browser lists public LMP servers, and you can direct-connect to any LMP 0.29.x server.

Why can't I see my friend in game? In LMP's default Subspace warp mode, players who time-warp end up at different times. Use the Sync button in the LMP status window to catch up. Craft within about 100 m of the launch pad are also hidden from other players (LMP's safety bubble).

My friend's craft doesn't appear for me. They're probably using DLC parts (Breaking Ground or Making History) that you don't own. LMP can't show craft with parts you don't have.

Loading takes ages with big modpacks. That's KSP itself. The first load after a mod change is the slowest, because Module Manager rebuilds its cache. Setting texture quality to Half in the launcher's Game settings saves a lot of RAM and loading time.

Known limitations (beta)

• Windows only for now.
• The installer is not code-signed yet.
• Some LMP behaviour is out of our hands, such as subspace warp and the safety bubble.

Credits & licences

• Apoapsis © 2026 Twinforge Studios. MIT licence.
• LunaMultiplayer © Gabriel Vazquez and contributors. MIT licence. Apoapsis downloads official LMP releases and does not modify them.
• Mods are downloaded from their authors' own release pages via CKAN metadata, and keep their own licences.
• Full third-party notices are in the launcher under Settings → About → Open source licences.

Kerbal Space Program is a trademark of Take-Two Interactive. Apoapsis is an unofficial community project and is not affiliated with or endorsed by Take-Two Interactive, Private Division or Squad.