Thank you for the answer.

Unfortunately, I was unable to get familiar with shared hosting and finally turned to more comfortable cloud server.

Just tried to setup 14.0.0-RC2 cloned from github, and received following:

Warning: require(/opt/una/install/../plugins/autoload.php): Failed to open stream: No such file or directory in /opt/una/install/index.php on line 56

Fatal error: Uncaught Error: Failed opening required '/opt/una/install/../plugins/autoload.php' (include_path='.:/usr/local/lib/php') in /opt/una/install/index.php:56 Stack trace: #0 {main} thrown in /opt/una/install/index.php on line 56

Some suggestions?