Missing polygons after ripping model?

ive never had this exact problem before, im trying to get Jersey Devil from the rare PC version, 3D Ripper DX or NinjaRipper don’t seem to work, they just won’t rip anything, but i did get it to actually rip with 3DVIA Printscreen, only problem is some polygons seem to be missing, parts of Jersey Devil’s face aren’t there, i was wondering if i would have to remodel it back as best as i can myself or if theres actually a way to fix this, anyone have any ideas?