I'll look into this but initially I can say this: Move your SH4 install OUT of Program Files (x86), since it looks like you're on Win 10 (or 8) installing under C:\Games\Ubisoft will help eliminate any problems from the UAC interfering in modding the game. I'm downloading now but am surprised at the size of the file!
I'm guessing there's a lot of stuff that can be cut out that you don't need.