The easiest way to install ONI mods is using the Steam Workshop. If you prefer to not use the steam workshop a local copy of my mods can be downloaded here.
Extract the zip archive and place the mods in the following folder:
- Windows
C:\Users\[USERNAME]\Documents\Klei\Oxygen Not Included\mods\Local - Mac OS
/Users/[USERNAME]/Library/Application Support/unity.Klei.Oxygen Not Included/mods/Local - Linux
~/.config/unity3d/Klei/Oxygen Not Included/mods/Local
Do not use the Steam version and the local version of the same mod simultaneously.