Hey my friend.
I downloaded Nifscope and Setbody Reloader. My windows is x64 yes.
I managed to open the upper body on nifscope.
There are few different things though.
Setbody folder only has DATA file and few text files.
Inside the DATA file I went through meshes/characters/bombshell and inside that there is only this NIF file called Nothing.nif
Btw what did you mean by setting up the game paths?
And do I need to know 3D modelling?