Ensure your files are not buried inside double folders (e.g., local/ModName/ModName/mod.dll ).
your desired mod (usually as a .zip file) from a source like GitHub or Nexus Mods . oxygen not included how to install mods manually
Use this only if you want features Harmony/C# mods require or if the mod author instructs ONI‑Modloader. Ensure your files are not buried inside double folders (e