All right! All the requirements have met:

• check PHP version >= 5.6.x
• check MySQLi extension for PHP
• check GD extension for PHP
• check Folder oc-content/uploads exists
• check oc-content/uploads folder is writable
• check Folder oc-content/downloads exists
• check oc-content/downloads folder is writable
• check Folder oc-content/languages folder exists
• check oc-content/languages folder is writable
• check Root directory is writable
• check config-sample.php file exists