If the game fails to start, delete your old configuration file ( AgonyConfig.ini ) and let the game regenerate it.
However, many users argue that since Madmind Studio no longer actively supports Agony (their focus is now on Succubus and Paradox of Hope ), the 5Codex update serves as an unofficial "final patch." From a moral standpoint, if you already purchased the game, applying a fan modification to improve performance and restore cut content is widely tolerated, though not endorsed. agony unrated update 5codex