Install FTL: Hyperspace on Windows manually
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Steam settings
Section titled “Steam settings”Skip this if you did not buy FTL on Steam.
Right-click FTL: Faster Than Light in your library and open Properties.
Show me how to open Properties

Under General, untick Keep game saves in the Steam Cloud. Turn off Steam Cloud first. It restores outdated saves with broken state, which can keep Hyperspace from launching and will undo any save fix you try later.
Show me the checkbox

Then under Updates, set automatic updates to Only update this game when I launch it.
Your saves live in
Documents\My Games\FasterThanLight. To get there, open File Explorer and paste%USERPROFILE%\Documents\My Gamesinto the address bar.Rename
FasterThanLighttoFasterThanLight-backup, then launch FTL. The game makes a fresh folder, and your original saves stay in the backup if you ever want them back.Do this once, right after turning Steam Cloud off. Cloud sync leaves behind a save that Hyperspace cannot read, which freezes the game at the end of the loading bar.
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Roll FTL back to 1.6.9
Section titled “Roll FTL back to 1.6.9”The Windows build of Hyperspace only runs on FTL 1.6.9. If Steam, GOG or Epic gave you anything newer (and they will have), roll it back first.
- Open FTL-Version-Rollback and choose Code → Download ZIP, then extract it.
- Copy the extracted contents into your FTL folder, next to
FTLGame.exe. That is usuallyC:\Program Files (x86)\Steam\steamapps\common\FTL Faster Than Light. - Run
rollback.bat.
Your original executable is kept as
FTLGame_orig.exe, so this is reversible. -
Install the Hyperspace binary
Section titled “Install the Hyperspace binary”Download
FTL.Hyperspace.x.xx.x-Windows.zipfrom the latest release and extract it. Inside you will find:- Hyperspace.ftl keep this for step 5
- README.txt
DirectoryWindows - Extract these files into where FTLGame.exe is/
- Hyperspace.dll
- xinput1_4.dll
Copy both files from that folder into your FTL folder, next to
FTLGame.exe. LeaveHyperspace.ftlwhere it is for now.On Steam, right-click FTL: Faster Than Light in your library and choose Manage → Browse local files. Steam opens the folder for you, which is safer than typing the path by hand.
Show me where that is in Steam

Got it from a different store? The folder is wherever you installed it.
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Set up a mod manager
Section titled “Set up a mod manager”You need a mod manager to patch
.ftlfiles into the game. ftlman is the one to use unless a mod misbehaves under it. The rest of this guide follows whichever tab you pick.Ftlman is the recomended mod manager for FTL: Hyperspace modding. Actively maintained and supports Hyperspace updates
- Download the build for your machine from the ftlman releases page.
- Extract the
ftlmanfolder anywhere you like. It does not have to live in your FTL directory. - If FTL is currently modded, revert it to vanilla first.
- Run
ftlman. A Steam install is detected automatically. If yours sits somewhere non-standard, or you have more than one copy and want a specific one, open Settings and set FTL data directory yourself.
The original manager, now deprecated.
- Make sure FTL is vanilla before installing or upgrading Slipstream. Check
ftl.dat: roughly 270 MB, or 212 MB on GOG. Much larger means mods are still patched in. - Download Slipstream 1.9.1.
- Extract it to a folder you will keep. Do not run it from inside the ZIP.
- Java must be installed.
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Patch Hyperspace in
Section titled “Patch Hyperspace in”Put the
Hyperspace.ftlfrom the ZIP into your manager’smodsfolder, tick it, and apply. Tick any other Hyperspace-based mods after it. -
Check it worked
Section titled “Check it worked”Launch FTL. About halfway through the loading screen, and again on the menu, a small version string appears in the top right. That is Hyperspace reporting itself, and it means the binary is loaded.
If your mod’s main menu comes up with no errors, you are done.
Hyperspace is now installed and ready to play. Everything below is optional.
Adding Multiverse
Section titled “Adding Multiverse”Multiverse is the largest mod built on Hyperspace, and it installs differently from everything else.
- Open the Multiverse release thread and scroll to DOWNLOAD RAW FILES (OTHER PLATFORMS, UPDATES, MANUAL INSTALL). Ignore the installer above it, that one is Windows-only and does its own thing.
- Download both files listed there, the Assets File and the Data File.
- Put both
.zipfiles in your mod manager’smodsfolder. - Patch them in this order, and nothing else:
- Press Scan in the top right so the new files show up
- Drag Multiverse Assets above Multiverse Data
- Tick both
- Leave Hyperspace unticked
- Press Apply
Show me what it should look like

- Enable ZIP support: Preferences → allow_zip, then File → Re-Scan mods/
- Tick FTL-Multiverse first, then any Multiverse-compatible add-ons
- Leave Hyperspace unticked
- Press Patch
Uninstalling
Section titled “Uninstalling”-
Put
Section titled “Put ftl.dat back to vanilla”ftl.datback to vanillaDeleting the mod files is not enough on its own.
ftl.datstill holds the patched content and has to be put back to vanilla.Delete
ftl.datand renameftl.dat.vanillaback toftl.dat.Slipstream keeps no vanilla copy. Untick every mod and press Patch again: patching with nothing selected is what writes the original
ftl.datback. -
Remove the Hyperspace files
Section titled “Remove the Hyperspace files”Delete
Hyperspace.dllandxinput1_4.dllfrom your FTL folder. -
Undo the rollback
Section titled “Undo the rollback”To go back to 1.6.14, delete
FTLGame.exeand renameFTLGame_orig.exeback toFTLGame.exe.