Thanks PlanetAlexander for your quick revert/Hi Satish, that model is extremely detailed and is almost 100k faces, way too many to be easily unfolded (I'm surprised Pepakura can even handle it!). You may want to look at simplifying it in a 3D program like Blender to make it easier to unfold, however you will lose detail.
i have simplified it to a low poly version using online site 3dless.com
Below is the low poly file.. can this be unfolded in pepakura please //