The path to yii framework seems to be incorrect.
You need to install Yii framework via composer or adjust the framework path in file requirements.php.
Please refer to the README on how to install Yii.
Warning: require_once(/home/fhdtest/public_html/vendor/yiisoft/yii2/requirements/YiiRequirementChecker.php): failed to open stream: No such file or directory in /home/fhdtest/public_html/requirements.php on line 23
Fatal error: require_once(): Failed opening required '/home/fhdtest/public_html/vendor/yiisoft/yii2/requirements/YiiRequirementChecker.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/fhdtest/public_html/requirements.php on line 23