Since this is a ROM hack, you do not download a full game file. Instead, you download a "patch" that you apply to a legal copy of your Pokemon Ultra Sun ROM or 3DS file.
When searching for a download link, you will likely see two versions: "Legit" and "Expanded."
Once launched, the game should display a custom "Supernova Sun" subtitle or modified text to confirm the mod is active. Why Choose the Expanded Version?
