Manual Installation

The CodeIgniter 4 framework repository holds the released versions of the framework. It is intended for developers who do not wish to use Composer.

Develop your app inside the app folder, and the public folder will be your public-facing document root. Do not change anything inside the system folder!


This is the installation technique closest to that described for CodeIgniter 3.


Download the latest version, and extract it to become your project root.

Setting Up



Download a new copy of the framework, and then follow the upgrade instructions in the release notice or changelog to merge that with your project.

Typically, you replace the system folder, and check designated app/Config folders for affected changes.


Download and run


You are responsible for merge conflicts when updating


Folders in your project after set up: app, public, system, writable

Translations Installation

If you want to take advantage of the system message translations, they can be added to your project in a similar fashion.

Download the latest version of them. Extract the downloaded zip, and copy the Language folder contents in it to your PROJECT_ROOT/app/Languages folder.

This would need to be repeated to incorporate any updates to the translations.