Listen, it’s the author’s choice if they want to update or not. Maybe they don’t have the time, maybe they’re still in school, maybe they have writers block. I know what it feels like to have such an amazing book not be updated for years, but you don’t need to hate on the author who made the book. If you keep hating on the author then maybe he/she/they will delete the book you are talking about, and we don’t want that to happen. So please, just be patient and hopeful that an update might happen.