Hey friend!
Mind sharing what you did to get it working?
I'm having a hard time trying to uncover what's wrong/missing with my installation. Sometimes no launch pad is loaded, sometimes Cape Canaveral is underwater.
**EDIT**
Found a fix!!!
(TL:DR): as mentioned before in this thread, issues in .cfg files .zip where in /Instances the @body addressed is "Kerbin" makes the game not load properly launch pads and the cape itself . Renaming all "Kerbin" fields to "Earth" in /Instances, installing KSSRS Earth Homeworld file from here and USING KSC Switcher solved for me.
My first problem was that even with every dependence properly installed and with KSRSS working perfectly nothing loaded. No Cape ground mesh and no new launch pads. KK Ctrl + K didn't (and honestly still doesn't) work properly too.
After wandering through the forums and /gamedata folder for hours, I tried, as someone kindly suggested in this thread before, renaming the "Kerbin" fields in .cfg files for Modern /Instances file to "Earth"; that fixed the Launch Pads not loading into the game. But then, they were floating in the ocean, and KSC seemed to be very far from them. So I tried to install KSC Switcher (again) after other users didn't recommend it. But that fixed the distance issue.
So one more to solve: mostly of Cape Canaveral was underwater. I couldn't exactly figure out what file(s) was causing this, but reading the files for EarthHomeWorld branch of KSRSS, knowing that the problem likely was around this "Earth-Kerbin" mismatch in .cfg files and seeing that every proper field in .cfg file was correctly addressed as "Earth", I gave it a shot and installed it. And Voilá! Cape Canaveral in its full beauty!
One more problem that I had was that I'm using AtmosphericBeats for Volumetric Clouds port for KSRSS. After solving Cape Canaveral issues, Earth didn't have clouds. So I went to GameData\AtmosphericBeats\EVE/Clouds.cfg and renamed every @object field whose "name" field was Earth but "body" field was Kerbin to Earth as well. Solved. Cape Canaveral working with beautiful Volumetric Clouds
Hope this helps someone.