To understand this update, you need to understand CODEX. They were a prominent "warez" group, a team of hackers who cracked the digital rights management (DRM) on games, making them available to download for free. This v1.031 release was their final, polished version of the initial Kakarot experience.
Therefore, "Dragon Ball Z Kakarot Update v1.031-CODEX" refers to a cracked version of the v1.031 official patch, repackaged by the group CODEX for users who had downloaded a pirated copy of the game. These updates were typically uploaded to various file-sharing websites and forums in January 2020, just days after the game's initial release.
Dragon Ball Z: Kakarot Update v1.031-CODEX is a 2020 scene release aimed at stabilizing the early-game state, addressing application crashes and reducing long loading times. Early reviews of this version highlighted faithful, high-quality cinematics contrasted with repetitive combat and shallow RPG mechanics. For specific user-reported issues with this update, visit Reddit's CrackSupport