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How to Install Mods on an Abiotic Factor Dedicated Server

A practical guide to installing PAK and UE4SS mods on an Abiotic Factor dedicated server, including client requirements, backups, verification, synchronization, and troubleshooting.
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Install Abiotic Factor mods only after stopping the dedicated server and backing up its world and mod folders. First identify the mod format: packaged PAK content is copied to AbioticFactor/Content/Paks, while a mod that explicitly requires UE4SS needs the UE4SS loader and its Mods directory. Then check whether the mod is server-only, client-only, or required on both sides. A client or both-side mod must be installed by every player in a compatible version. Restart the server, watch the console or logs for load errors, and add mods one at a time while troubleshooting.

If you would rather manage an Abiotic Factor game server through a hosting panel than install files manually, Godlike.Host’s Abiotic Factor hosting includes a Pterodactyl-based game panel for server management. Not on the Abiotic Factor dedicated server wiki’s list of Verified Server Providers (github.com/DFJacob/AbioticFactorDedicatedServer, 10 Oct 2026).

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What you need before changing the server

Have access to the dedicated-server installation directory, permission to stop and start the process, and a way to copy files (local access, an FTP client, or a host’s file manager). Keep the game build, each mod’s version, and its installation instructions beside you. Abiotic Factor has more than one mod format, and putting a file in the wrong directory can make it appear to be missing or prevent the server from starting.

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  • A stopped server: shut down the process cleanly before replacing or adding files. Do not copy archives while the server is writing a save.
  • A recoverable backup: preserve the world/save files and the original mod directories. A backup gives you a known-good rollback point if a package causes a crash or corrupts a configuration.
  • The mod’s current instructions: read the author’s page immediately before installation. Look for the format (PAK or UE4SS), dependencies, game-build requirements, and whether clients also need the mod.
  • A change log: record the date, server game build, mod version, dependencies, and result of each change. There is no universal Abiotic Factor compatibility list, so your own record is the reliable history for this server.

Install or locate the dedicated server

If the server is not installed yet, a community quickstart published on June 5, 2024 used Steam or SteamCMD and the following SteamCMD command:

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The same quickstart described the dedicated server as Windows-only at that time. That statement is dated and platform support can change; verify the current server build and requirements before choosing an operating system. If you already have a working server, locate its installation root instead of creating a second copy. The paths below are relative to that root.

After installation or an update, start the server once without new mods. Confirm that it creates its normal directories and can load the unmodified world. This baseline makes it possible to tell whether a later failure came from a mod rather than from the server installation itself.

Identify the mod format and scope

Do not assume every download uses the same loader. Open the mod’s current instructions and inspect the files and requirements.

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Mod type Typical files or wording Required server action Possible client action
Packaged PAK content .pak, often accompanied by .ucas and .utoc; instructions refer to packaged content Copy the intended files into AbioticFactor/Content/Paks. Install the same package in the game’s Paks folder when the author marks it client-side or both-side.
UE4SS script mod Instructions explicitly require UE4SS or a script package for its loader Install the UE4SS loader as instructed, then place the script package in the loader’s Mods directory. Players need the loader and matching script package when the mod is client-side or both-side.

Scope matters as much as format. A server-only mod is loaded by the server and does not require a matching client installation. A client-only mod is loaded by each player and does not belong in the server’s mod directory. A both-side mod requires compatible files on the server and every participating client. If the page does not state the scope clearly, treat that uncertainty as a compatibility risk and ask the author or test with a private server before inviting players.

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Install a PAK mod on the dedicated server

Use this procedure for a mod whose instructions describe packaged Unreal content and whose files include a PAK-style package. Preserve the archive’s intended names and folder layout; do not rename files to make them look consistent with another mod.

  1. Stop the server and confirm the process has exited. Wait until the console closes or the service reports that it has stopped. If the host provides a stop button, use it rather than killing the process while it is saving.
  2. Back up the current state. Copy the world/save files and the existing AbioticFactor/Content/Paks directory to a dated backup location. Include configuration files if the mod’s instructions say it creates or changes them.
  3. Open the server’s content directory. From the dedicated-server root, navigate to AbioticFactor/Content/Paks. Create the directory only if the clean server installation does not already contain it; do not create a second, similarly named folder elsewhere.
  4. Copy the package files. Upload the mod’s .pak file and any accompanying .ucas or .utoc files into that Paks directory. If the archive contains a prescribed subfolder or several files, reproduce that layout exactly as documented by the author.
  5. Check dependencies and versions. Some packages rely on another mod or on a particular game build. Install prerequisites in the order the author specifies and write each version in your change log. Do not infer compatibility from a filename alone.
  6. Start the server and inspect output. Watch the console and log files for file-not-found, dependency, version, or load errors. A server that reaches its normal ready state is not proof that every package loaded; look for the mod’s own initialization message when the author documents one.
  7. Test with one change at a time. Join with a test account or load a test world and exercise the feature. If the server crashes, remove only the newly added package first and restore the backup if necessary.

For a client-side or both-side PAK mod, players install the matching files in their own game installation. A commonly documented Windows client path is SteamsteamappscommonAbioticFactorAbioticFactorContentPaks. The exact Steam library location can differ, so players should use the library that contains their Abiotic Factor installation. Every player needs the same compatible mod version; a server copy alone cannot satisfy a client-side requirement.

Install a UE4SS mod

UE4SS content follows a different workflow from a PAK drop-in. A script package placed directly in Content/Paks will not become a working UE4SS mod merely because the file copied successfully.

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  1. Confirm the requirement. The mod page must explicitly call for UE4SS or describe its script package. If it supplies only PAK files, use the PAK procedure instead.
  2. Stop the server and make a fresh backup. Preserve the clean loader files as well as the current world and configuration. Loader updates and script changes can affect more than one mod.
  3. Install the UE4SS loader. Follow the loader and mod author’s current dedicated-server instructions. Use the loader version they support for your game build; do not substitute an arbitrary copy from another game or an old tutorial.
  4. Place the script package in the loader’s Mods directory. Copy the mod’s package into the UE4SS Mods directory, retaining the folder and file names supplied by the author. If the package includes a required subdirectory, keep it intact rather than flattening every file into one folder.
  5. Install stated dependencies and configuration. UE4SS mods can depend on other script packages or configuration files. Follow the documented order and keep a note of each dependency and setting so you can reproduce the installation on another machine.
  6. Restart and read the loader output. Look for UE4SS initialization and the mod’s load message in the console or logs. Treat warnings about missing scripts, incompatible builds, or disabled mods as installation failures until resolved.
  7. Test in isolation. If the server crashes or behaves incorrectly, disable the newly added script package, restart, and then test the loader with the remaining known-good set. Add packages back one at a time.

When the mod is client-only or both-side, players need the corresponding UE4SS loader and script package in their own game installation as specified by the mod author. Do not send a server-only loader or script to every player unless the instructions explicitly require it; unnecessary client components create another source of version drift.

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Decide what players must install

Read the scope declaration for every mod instead of applying one rule to the entire collection. Keep a simple manifest with a row for each package:

Manifest field What to record
Name and format The mod name and whether it is PAK or UE4SS.
Version and game build The exact release and any required Abiotic Factor build.
Scope Server-only, client-only, or both-side.
Dependencies Required loaders, libraries, or companion mods, with versions.
File placement Server path and, where needed, client path.
Configuration Settings that must match, plus the date they were last changed.

For a both-side package, distribute the exact same archive or a profile that resolves to the same version. Do not let players update independently between sessions. A client may connect successfully while still having an incompatible feature, so test the feature rather than relying only on a successful login.

Restart and verify the installation

Use a controlled restart after each change. Start the server, wait for its normal ready state, and review the complete startup output instead of checking only the last line. Record warnings even when the server appears playable.

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  • Expected result: the process remains running, reaches its normal ready state, and shows no unresolved loader, dependency, or package errors.
  • Functional test: connect with a test client, exercise the mod’s advertised feature, and check that existing saves still load.
  • Compatibility test: have a second player join when the mod is both-side. Verify that both clients see the same behavior.
  • Change isolation: if something fails, stop the server, remove or disable only the latest addition, and repeat the test before changing anything else.

Keep the game build, mod versions, log symptoms, and outcome in the change log. Because compatibility changes with game updates and loader releases, this record is more useful than an undated folder full of packages.

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Keep a group’s mod list synchronized

For a small private server, a written manifest and a shared archive may be enough. For a larger group, use a Thunderstore or r2modman profile when the mod authors support it. A profile can record dependencies and configuration so each player starts from the same definition rather than assembling files manually.

When creating a distributable modpack, include the mod configuration and dependency information. Thunderstore’s modpack guidance distinguishes those files from the loader core and plugin code: the pack should describe what to install, not duplicate loader components that the client manager supplies. Follow the current profile tool’s export rules and the individual mod authors’ licenses.

Before a scheduled session, compare the server manifest with one client profile. After an update, change one variable at a time and note whether the server, clients, or both were updated. If a player reports a mismatch, have them remove the old profile or package and install the manifest version rather than layering a new copy over unknown files.

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Troubleshoot common failures

The server starts but the mod does nothing

  • Recheck the mod type. A UE4SS script in Content/Paks, or a PAK file in the UE4SS Mods directory, is in the wrong location.
  • Confirm the files are inside the active server installation, not a different Steam library or an unused staging folder.
  • Check the startup log for a dependency or game-build warning and install the exact prerequisite named by the author.
  • Verify that the mod is enabled according to its instructions; some UE4SS packages use a required folder name or configuration entry.

The server crashes during startup

  1. Stop the process and preserve the crash log and the last startup log.
  2. Remove the most recently added or updated package and restart.
  3. If the crash remains, restore the backed-up mod directory and test the clean baseline.
  4. Add packages back one at a time until the failing change is identified. Compare its required game build, loader version, and dependencies with the current server.

Do not delete the world first. A mod file or loader mismatch is a more reversible cause than save loss, and the backup lets you separate those possibilities.

Players cannot join or are disconnected

  • Determine whether the mod is client-only or both-side. If it is, every player must install the matching version and any required loader.
  • Compare the client PAK or UE4SS files with the server manifest, including dependencies and configuration.
  • Ask affected players to remove duplicate or older copies before installing the known-good profile. Multiple versions in different directories can produce confusing results.
  • Test with an unmodded client only when the mod is documented as server-only; otherwise that test does not prove the setup is valid.

The server works but the world desynchronizes

Stop adding mods and reduce the setup to the last known-good combination. Test the suspected package alone, then with its dependencies, then with the remaining collection. Record whether the problem occurs for every player or only clients missing a both-side package. If the author has not published compatibility for the current game build, treat the result as unconfirmed rather than declaring the mod universally broken.

Update, remove, or roll back a mod safely

Updating

  1. Read the new release instructions and note changed dependencies, loader requirements, and client scope.
  2. Stop the server and back up the world, configuration, and current mod files.
  3. Replace the old package rather than leaving two versions with similar names. Preserve any configuration that the new release says to keep.
  4. Update clients when the mod is client-only or both-side. Everyone should move to the same compatible release before the next session.
  5. Restart, inspect logs, and run the functional test. Record the result and the previous version for rollback.

Removing

Stop the server, remove only the files belonging to the mod, and restore any configuration entries that the author says are no longer needed. Keep the removed files in a dated backup until the world has been tested. Players should remove the corresponding client package when the mod was client-side or both-side.

Rolling back

Stop the server, restore the previous mod files and configuration from the dated backup, and return clients to the matching versions. Start the server and verify the same test case that exposed the problem. If the world was saved while a mod was active, keep a separate copy of that save before attempting a rollback; the backup allows you to compare outcomes without overwriting your only copy.

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Quick pre-launch checklist

  • Server installation and current platform support verified.
  • Server stopped before file changes.
  • World, configuration, and original mod directories backed up.
  • Every mod classified as PAK or UE4SS.
  • PAK files placed in AbioticFactor/Content/Paks.
  • UE4SS loader installed as required and scripts placed in its Mods directory.
  • Server-only, client-only, and both-side scope recorded.
  • Client files and versions synchronized where required.
  • Dependencies, game build, and configuration recorded in a manifest.
  • Server restarted and logs checked for load failures.
  • One-mod-at-a-time test completed, with a rollback copy retained.

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