Warning: Installation directory exists at: /home/hosting/prv-hosting/prv.pl/d/m/sklepmd/zc_install. Please remove this directory for security reasons.

Warning: I am able to write to the configuration file: /home/hosting/prv-hosting/prv.pl/d/m/sklepmd/includes/configure.php. This is a potential security risk - please set the right user permissions on this file (read-only, CHMOD 644 or 444 are typical). You may need to use your webhost control panel/file-manager to change the permissions effectively. Contact your webhost for assistance.

Your database appears to need patching to a higher level. See Admin->Tools->Server Information to review patch levels.