[split] Installer didn't

Yes it runs on Linux (Debian 9.6) but now this is the result

[InvalidArgumentException]                                                   
  Could not find package codeigniter4/framework with stability alpha in a ver  
  sion installable using your PHP version 7.0.33.

You need PHP 7.1 or higher. This is clear on both the user guide and the composer package page.

https://codeigniter4.github.io/CodeIgnit...ments.html
https://packagist.org/packages/codeigniter4/framework

Thank You, I updated PHP to 7.2 version and at the end of installation by Composer i receive this message

Script bash admin/setup.sh handling the post-update-cmd event returned with error code 127