PSXPrev (PSX Model/Texture Viewer) (Released!)

[mekkemikkel]

Hi, 
I feel kinda stupid for asking this, but how do you use this tool? I have never done anything related to GitHub, and I installed Visual Studio for this. 
I really don't understand how I do this.
I'm trying to extract some 3D models from Harry Potter and The Sorcerer's Stone on the PS1.

If someone could write a quick "How-to" I would be veeeeerry happy.
I am going to use the models in an art project, this is why I am such a noob in coding and such, because I'm not actually a programmer in any stretch of the imagination.

Thanks in advance!