Look.
It opens the model without the textures, right?
Did you try and covert the textures and then apply them?
tga is just an image file: all textures are image files. If hitfilm can't open tga, try jpg, tiff or whatever works.
Have you ever imported an object and applied textures to it?
I'm no expert on 3D, I took those classes not to become a 3D animator, but to be able to communicate with them on a technical level. Textures are always a PITA, IMO, unless you really know how to apply them.
You can try every free or not free 3D program out there: in most cases you'll still have to apply the textures yourself.