Server : Apache System : Linux server1.cgrithy.com 3.10.0-1160.95.1.el7.x86_64 #1 SMP Mon Jul 24 13:59:37 UTC 2023 x86_64 User : nobody ( 99) PHP Version : 8.1.23 Disable Function : NONE Directory :  /var/softaculous/igniter/

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PHP REQUIREMENT LINK : http://codeigniter.com/user_guide/intro/requirements.html and also README.md(PHP 8.1 is required since Codeigniter 4.5.0 )
Download the package using composer. (Since 4.0.4) - php composer.phar create-project codeigniter4/appstarter /{{PATH}}/{{TO}}/{{CODEIGNITER_DIRECTORY}}