Record what changed before replacing more files: game edition, game build, loader version, mod release and the exact error. That is more useful than trying several incompatible archives in the same folder.
Isolate the change
Keep valuable saves separate while testing. Compare the smallest mod set, then follow the installed project’s own removal instructions. Restoring clean game files can distinguish a modded failure from a vanilla problem, but this is not a guarantee of recovering a modified save.
Steam’s file verification restores managed game files; it does not necessarily remove every additional plugin file. Keep your installation record so you can identify what was added.
Casualties Together deactivation
The README names Settings → General → Deactivate MP Mod to return to single-player. Deactivation is an in-game mode action, not documented here as a complete file uninstall.
Do not remove guessed folders during a valuable run or assume switching modes repairs all prior state changes.
Report a reproducible failure
Include whether the interface never appeared, the lobby failed, or a particular layer event desynchronized. The mod author explicitly directs mod issues to the mod project rather than the original developer. Read connection checks and the selected release notes before reporting an already documented issue.
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.