I'm having an issue with this. AVP worked fine for me in 1.8, but I'm having some issues in 1.9. This is what Kerbin looks like when I launch the game:
https://gyazo.com/eedd82a0c0670c9e57e520fdef4409bf
Scatterer is making the sky black during the day. It was fixed by removing it, but I still want the mod. I've seen other people having the same issue but no one gave them a solution.
It's a .dds file just like the the stock logos. I followed this guide: https://forum.kerbalspaceprogram.com/index.php?/topic/114187-adding-custom-agency/
I had zero idea what I was doing. I could do the self explanatory stuff like decouplers and parachutes, but I did stupid stuff like put heat shields on TOP of my capsule instead of underneath. I never would of progressed without Scott Manley.
Practice is really important. The first time you orbit Kerbin it's gonna be really inefficient. But after doing it enough, you'll eventually know when to do your orbital turns, etc.
I wanted to add custom agencies so I installed a mod (it's not technically a mod, it just has an agencies folder in it). I removed the ones I wanted and added one, but when I see that agency offer me a contract their flag/logo is just pure white.