nostr:npub19zq9jfyaxp5d9x2wzm9p4gr7cndhtap5qs549efkxpwgagwwz65svnu4m5 Check steam folders. steamapps/common or steamapps/music , or at the short end, steam library soundracks. Is anything there?
How was the OST even advertized? Did they promise flac album or just an in-game jukebox?