1. 
Copy the contents from the GameData folder into your own GameData folder in your KSP directory.

2. 
Install the version of Kopernicus matching your KSP version.

3. <optional>
This mod both supports scatterer and EVE. There's also a modified BoulderCo included to match the Planet pack clouds.
Consider removing this one if you already have other visual mods for the stock system.

4. (links)
scatterer: https://spacedock.info/mod/141/scatterer (needs to match your KSP version)
EVE: https://github.com/WazWaz/EnvironmentalVisualEnhancements/releases (needs to match your KSP version)
Kopernicus: https://forum.kerbalspaceprogram.com/index.php?/topic/181547-173-2-backports-kopernicus-kittopiatech/ (needs to match your KSP version)