Steam users can purchase the Spiritfarer®: Farewell Edition - Digital Artbook as downloadable content (DLC). You can find it directly on the Steam store at this link: https://store.steampowered.com/app/1398770/Spiritfarer__Digital_Artbook/ Note: This requires owning the full Spiritfarer base game on Steam as well.
Spiritfarer®: Farewell Edition – Digital Artbook is an official companion to the game that functions more like a narrative "Director’s Cut" than a simple gallery. While often searched for as a "free PDF download," it is a paid digital product available for approximately on platforms like Quick Verdict: 9/10 Spiritfarer Digital Artbook Pdf Download Free