You launch the game, the menu is in English, but V (the protagonist) only grunts. No dialogue plays. That is the classic sign of a version mismatch.
The keyword refers to a specific localized data package released by the scene group CODEX alongside the massive Patch 1.5 & Next-Generation Update . This update was a turning point for Cyberpunk 2077 , introducing significant AI improvements, vehicle handling overhauls, and essential character customization features. Overview of Patch 1.5 Changes Cyberpunk 2077 Language Pack v1 5-CODEX