Merge the GameData folder with the existing one in your KSP directory. KSP will then load it as an add-on. The source folder simply contains the source code (in C#) for the plugin. If you didn't ...

ROCapsules is a mod that takes the best versions of capsules available and uses them as the in-game models for Realism Overhaul parts.

Typography, logos, rebrands, and portfolios, plus thousands of interviews with both new and established designers. Whatever your graphic design needs, you'll find what you're looking for right here.