Since CODEX officially shut down in February 2022, many "CODEX" releases online are fakes or re-uploads from other groups. SSQ continues to use the CODEX tag for brand recognition, but there is no official support.
Legitimate CODEX releases do not require a password for installation. If a password is requested, the file is likely unsafe. The "install" process typically involves extracting the archive, running a setup executable, disabling antivirus to prevent false flags, and ensuring the emulator/crack files are correctly placed in the game directory.
To ensure a "solid" installation without errors, follow this general workflow: