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Quick Start Guide
The preview sample rendering results using 4K Texture and HDRI. But the .blend file format available for download uses 1K or 2K as the sample. I do this to reduce the file size when you download it. That's why I placed the reference link for you to download and choose the resolution you need.
The original files that I modelling is output with .blend format. Available the other formats (fbx, obj, 3ds, dae, stl) it is exported from Blender 2.79b software.