AppController.php

<?php
       // Open PROJECT_ROOT/src/Controller/AppController.php file and go to line no 123 (approximate line or find $this->Auth->allow)
       // And then replace this snippet with below snippet.
       $this->Auth->allow([
            'signup',
            'verifyEmail',
            'forgotPassword',
            'install',
            'resetPassword',
            'requirements',
            'database',
            'general',
            'administrator',
            'emailConfig'
        ]);
        
        
        $this->Auth->allow([
            'signup',
            'verifyEmail',
            'forgotPassword',
            'resetPassword',
        ]);
        
        ?>

InstallationController.php

<?php
// Open PROJECT_ROOT/src/Controller/InstallationController.php file and go to line no 47. ((approximate line)
// And then add this code inside beforeFilter() function.

      $this->Auth->allow([
            'install',
            'requirements',
            'database',
            'general',
            'administrator',
            'emailConfig'
        ]);
        
        
        // Finally beforeFilter() will look like.
        
        public function beforeFilter(Event $event)
       {
        $this->Auth->allow([
            'requirements',
            'database',
            'general',
            'administrator',
            'emailConfig'
        ]);

        parent::beforeFilter($event);
        $this->viewBuilder()
            ->layout('installation')
            ->theme($this->currentTheme);

        if (file_exists(ROOT . '/Conf/config.ini')) {
            $iniData = parse_ini_file(ROOT . '/Conf/config.ini');
            if (isset($iniData['INSTALLATION_RESULT']) && $iniData['INSTALLATION_RESULT']) {
                $this->redirect($this->referer());
            }
        }
    }

?>

Hi

use

 $this->Auth->allow([
        'signup',
        'verifyEmail',
        'forgotPassword',
        'resetPassword',
    ]);

to replace or add after line 130 ?