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 ...
Kerbals now have own backpack to hold small items, and some of them can be equipped on the model. AR goggles? Fancy hat? Or, maybe, a completely new helmet?! It's all possible now! With special tools ...
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