If a language is listed but not active, verify that the corresponding .archive files from the pack are located in the \archive\pc\content folder of your game directory.
: Each individual language pack for Cyberpunk 2077 can require up to 2.9 GB of additional storage space. Can't install my language — Cyberpunk 2077 Cyberpunk 2077 Language Pack v1 5-CODEX
The CODEX language pack may offer multiple installation options: If a language is listed but not active,