As this is a fan-made project, it is not available on official storefronts like Steam or the Epic Games Store. The developers distribute the game directly through their community channels.
You can find the latest build of Sonic P-06, including Silver’s campaign, through the official community mirrors and creator updates. sonic p-06 silver release download
Download links are maintained in the video description of the Project '06 - Silver Release trailer ChaosX YouTube channel Mirror Links: As this is a fan-made project, it is
The Silver Release marks a major milestone for the fan remake, including: Full Silver Campaign As this is a fan-made project