Installing Blender and all the import/export scripts and the right Python version can be confusing. Thankfully the kind people at YSFHQ have been able to simplify things for you.
Eric T. assembled this all in one zip file. Simply extract to a location of your choice and you are good to go. All the YS Paint Scripts and the right Python version is included. Simply unzip the file, run the Blender executable, and mod away!