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KSP (1.12.3) + RSS (18.5.0) + DMP (0.3.8.3)
4 projects | reddit.com/r/RealSolarSystem | 26 Apr 2022
KSP-RO/RSS-Textures (link to the 4k textures but there are other quality versions also) - https://github.com/KSP-RO/RSS-Textures/releases/download/v18.4/4096.zip
I’m begging you.
6 projects | reddit.com/r/RealSolarSystem | 6 May 2021
Step 4: Real Solar System. This is the bread and butter of KSP RSSRO. Download the newest release here: https://github.com/KSP-RO/RealSolarSystem/releases/tag/v18.1.4. Once you have done this, download the latest RSS textures (right here https://github.com/KSP-RO/RSS-Textures/releases/tag/v18.3) and pick one of the options. What you pick is dependent on your ram. If you have 16 gb or more and a powerful processor, the 16384 (16k) should be fine. If you have 8, I would suggest the 2048. If you have 16 gb but a lower end processor, I'd get the 8k or 4k textures respectively. I like 8k, it works well for my i5 6600k. Move the folder included (RSS-Textures) to the GameData folder. After that, you should be good.
What are some alternatives?
Ferram-Aerospace-Research - Aerodynamics model for Kerbal Space Program
RealSolarSystem - Changes KSP's solar system to make it like the real one.
RealHeat - A real heating (not temperature) model for KSP
ModularFuelSystem - Modular fuel tanks and engines, with real fuels and realistic performance.