Inside the extracted folder, there is usually a setup.exe . Run this and point it to the directory where your main Amnesia: Rebirth game is installed.
Antivirus software often flags "cracked" .dll files (like Steam_api64.dll ) as false positives. If the game won't launch after the update, check your antivirus quarantine and restore the files. Amnesia.Rebirth.Update.v1.40-CODEX.rar
General stability fixes and bug patches common to post-launch support. Inside the extracted folder, there is usually a setup
A new way to play that removes life-threatening monster encounters and the "fear" mechanic (visual/audio distortions caused by darkness). It also adds new puzzles and brighter environments. Inside the extracted folder
Updates to the HPL3.5 engine to ensure smoother frame rates on various hardware configurations. 2. How to Install (Standard CODEX Procedure)