• Import the SpeedTree 8 tree into your Unity project.
• Drag the tree in scene and create a new prefab from it.
• Create new materials.
• For new materials, replace the shader with the STC8 Pro shader.
• Set up new materials (add textures, color, etc.).
• See the description of all shader settings here - nvjob.github.io/unity/nvjob-stc-8-pro
• Apply the materials to the prefab.
• Save the prefab. Use this prefab instead of the original SpeedTree 8 file.