Did you actually apply the crack over top of the original files? You say you’re running the executable in the CODEX directory, but the CODEX directory would be where the temporary crack files are, not where the game is expecting them. You can also try installing the latest repack from KaOs, which you can find on 1337x by searching for “skyrim repack kaos”. The repack will auto-crack everything so you can be sure that at least that is done correctly.