These are the following dependencies for Realism Environmental Overhaul. You must install all of these and all their dependencies for this mod to work properly.

KSP Version 1.10.1.2939+
Real Solar System Version 18.4.0
Scatterer Version 0.0772
Environmental Visual Enhancements Version 1.11.6.1
Scatterer Sunflare Version 0.0772