Installation issues in vtenext20ce.tgz from sourceforge

[oppiet30]

I get these errors when running the install script:

[17-Jul-2023 01:48:22 UTC] PHP Warning:  Undefined variable $bigTitle in /var/www/html/vtenext/install/templates/section.php on line 6
[17-Jul-2023 01:48:22 UTC] PHP Warning:  Undefined variable $bigTitle in /var/www/html/vtenext/install/templates/section.php on line 7
[17-Jul-2023 01:48:24 UTC] PHP Fatal error:  Uncaught Error: Non-static method Common_Install_Wizard_Utils::getRecommendedDirectives() cannot be called statically in /var/www/html/vtenext/install/CheckSystem.php:47
Stack trace:
#0 /var/www/html/vtenext/install.php(41): include()
#1 {main}
  thrown in /var/www/html/vtenext/install/CheckSystem.php on line 47

I am using:

PHP 8.2.8 (cli) (built: Jul  4 2023 14:52:54) (NTS gcc x86_64)
Copyright (c) The PHP Group
Zend Engine v4.2.8, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.8, Copyright (c), by Zend Technologies

This is on a Fedora 38 box.