Start by matching the selected mod release to your game edition. The author’s v5.5.0 notes target full game 1.0; older demo-target releases are not interchangeable with it.
Documented installation flow
- In Steam, right-click the intended game entry and choose Manage → Browse local files.
- Read the selected release’s prerequisites. The repository README names BepInEx 5.4.23.5, Windows x64; use the release instructions if they supersede it.
- Extract the required BepInEx package into the game root.
- Extract the MPMod archive, open its
modfolder, and move that folder’s contents into the game root. - Launch from Steam and check for multiplayer-related menu buttons.
Do not leave everything buried inside an extra mod subfolder. Also avoid installing into the demo directory when you intended to modify the full game.
Before trying a valuable run
Keep a record of the exact game, loader and mod versions on each machine. Back up valuable saves before third-party changes. We have reviewed the instructions but have not tested this installation ourselves.
If it looks unchanged
Check the folder nesting, executable architecture and whether the correct Steam entry was launched. Installing a loader is not proof that the mod loaded or that a connection succeeded. Continue with co-op troubleshooting rather than adding unrelated plugins.
Sources & version notes
Reviewed against the primary sources below. Version-dependent details are identified in the article; these procedures have not been personally playtested.
- Casualties Together author installation and features (2026-11-11 checked)
- Casualties Together versioned releases, including v5.5.0 (2026-11-10 / checked 2026-11-11)
Compiled from public sources. We have not personally played or tested these procedures. Check your installed build and its tooltips when details differ.