This version of Outer Planets Mod has been built to work for KSP version 1.3.1 - 1.12.*.
The Outer Planets Mod is a mod that expands the outer edges of the Kerbol system to create something akin to the real Solar System's. It adds Kerbalized versions of Saturn, Uranus, Neptune and Pluto as well as several of these planets' moons. These faraway planets provide a challenge rarely encountered in Kerbal Space Program; you'll have to figure out new transfer windows, manage your power supply differently, provide your spacecraft with more Delta-V and be ready to travel years or even decades.
Extract the GameData folder found in the downloadable .zip directly into your Kerbal Space Program install directory. If located correctly, the OPM and CTTP directories should be found at:
The following KSP mods must be installed prior to using Outer Planets Mod (ensure you install the correct version of the dependencies for your version of KSP):
Previous changelogs can be found on the GitHub repository or the original forum thread: https://forum.kerbalspaceprogram.com/index.php?/topic/93999-1
Outer Planets Mod is being maintained by a collaborative group. The mod is still licensed under the original Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.