for the PlayStation 4. While this specific ID is often cited in homebrew and modding communities for save files and patches, legal digital downloads are managed directly through the official PlayStation Store Direct Download & Purchase Options
The CUSA34388 identifier refers specifically to the of God of War Ragnarök download god of war ragnarok cusa34388 link
When searching for download links, be cautious of websites offering "free" downloads or cracks, as they might: for the PlayStation 4
(only relevant for physical discs)