Install.php

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<?php
define('TYPO3_MODE', 'BE');
define('TYPO3_enterInstallScript', '1');

// Bootstrap bare minimum: class loader, LocalConfiguration, but no extensions and such
require __DIR__ . '/../../core/Classes/Core/Bootstrap.php';
\TYPO3\CMS\Core\Core\Bootstrap::getInstance()
    ->baseSetup('typo3/sysext/install/Start/')
    ->startOutputBuffering()
    ->loadConfigurationAndInitialize(FALSE, 'TYPO3\\CMS\\Core\\Package\\FailsafePackageManager');

// Execute 'tool' or 'step' controller depending on install[controller] GET/POST parameter
$getPost = \TYPO3\CMS\Core\Utility\GeneralUtility::_GP('install');
$controllerClassName = 'TYPO3\\CMS\\Install\\Controller\\StepController';
if (isset($getPost['controller'])) {
    switch ($getPost['controller']) {
        case 'tool':
            $controllerClassName = 'TYPO3\\CMS\\Install\\Controller\\ToolController';
            break;
        case 'ajax':
            $controllerClassName = 'TYPO3\\CMS\\Install\\Controller\\AjaxController';
            break;
    }
}
\TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($controllerClassName)->execute();