I don’t know Kerkythea, but from the image I would bet that the light is coming from the standard SU sun (sharp shadows) and no special lighting setup.
Pay a visit to Kerkythea
Kerkythea is a bit of a deep pool to get started with.
Study the Getting Started Guide thoroughly and the rest comes more easily.
Kerkythea has a powerful File > Merge function.
If ‘they’ want you to duplicate ‘their’ materials and settings; they can (should) send you their setup files.