You will see your manually installed mods listed. They are usually distinguished by a (local) rather than a Steam icon. Click the checkbox next to the mod to Enable it. The game will prompt you to Restart to apply changes. Troubleshooting Common Issues
\Users\%USERNAME%\Documents\Klei\OxygenNotIncluded\mods\local oxygen not included how to install mods manually
Unlike many games where you drop files into the installation directory, ONI looks for manual mods in your folder. You will see your manually installed mods listed
Open the extracted folder. You should see a file named mod_info.yaml and a mod.dll (or a strings folder). oxygen not included how to install mods manually