Pre installation wizard stopped with this error:
Fatal error: Call to undefined function curl_multi_init() in /home/www/domains/das.hu/public/wp-content/plugins/bulletproof-security/admin/wizard/wizard.php on line 224
My guess would be that the PHP curl_multi_init() function is disabled on your host server. That particular function is used in the Pre-Installation Wizard cURL scanner for the Plugin Firewall, which is pretty much obsolete since the new Plugin Firewall AutoPilot Mode feature was created. Go to the Setup menu > Setup Wizard page > Setup Wizard Options tab page > cURL Scan Option: Turn On|Off cURL Scan option setting > change the setting to cURL Scan Off > click the cURL|DB Monitor Options button. Then rerun the Pre-Installation Wizard and Setup Wizard.