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./othercms/xenForo 2.2.8/src/XF/Install/Controller/Index.php
<?php

namespace XF\Install\Controller;

class
Index extends AbstractController
{
    public function
actionIndex()
    {
       
$installHelper = $this->getInstallHelper();

        if (
$installHelper->isInstalled())
        {
            return
$this->redirect('index.php?upgrade/');
        }
        else
        {
            return
$this->redirect('index.php?install/');
        }
    }
}