It’s very very simple to install in your localhost or server
How to install and download Codeigniter?
Here some steps are listed please follow these
Step1- Click at the link to download the Codeigniter
https://www.codeigniter.com/download
Step2- Unzip the folder and rename as your project name, you can change later as on requirement.
Step3- Set the base URL by open application/config/config.php file with a text editor.
$config[‘base_url’] = ‘http://localhost’;
Now Just Open Browser and type http://localhost/your_project_name
That’s it…
Next, We will go for Database Setup and Changes Some Basic Configurations for Development.