Many CODEX releases include a checkbox that says "Copy contents of CODEX directory to installdir" . Check this box to automate the "crack" process.
Ensure you have part01.rar , part02.rar , part03.rar , and so on. Forza.Horizon.5-CODEX.part02.rar
Once extraction is finished, you will typically see a large file or a folder containing the game setup. Many CODEX releases include a checkbox that says