If you are looking for specific titles or original French versions, they are often sold separately:
: Available as a Kindle ebook in the original French.
There is no official "zip" file containing the complete works of Guillaume Dustan available for legal download. However, you can find digital editions of his major collections and individual novels through various official publishers and digital libraries.
: You can borrow the EPUB ebook if you have a participating library card. Individual Works & French Editions