Assuming you have the base Cyberpunk 2077 v1.5 CODEX release installed, here is how to apply the language pack.
: Unofficial downloads from peer-to-peer sites may contain bundled malware or adware. cyberpunk 2077 language pack v1 5codex
Search for a file named exactly Cyberpunk.2077.Language.Pack.v1.5-CODEX or a similar label from trusted scene sources. Avoid "universal" packs; they rarely work with CODEX emus. Assuming you have the base Cyberpunk 2077 v1