第一次运行Fatal error: require_once找不到文件

环境centos7.4，php5.4环境检测通过，但是运行报错
如下:

# php start.php start -d
PHP Warning:  require_once(/root/workerman-todpole/vendor/autoload.php): failed to open stream: No such file or directory in /root/workerman-todpole/start.php on line 29

Warning: require_once(/root/workerman-todpole/vendor/autoload.php): failed to open stream: No such file or directory in /root/workerman-todpole/start.php on line 29
PHP Fatal error:  require_once(): Failed opening required '/root/workerman-todpole/vendor/autoload.php' (include_path='.:/usr/share/pear:/usr/share/php') in /root/workerman-todpole/start.php on line 29

Fatal error: require_once(): Failed opening required '/root/workerman-todpole/vendor/autoload.php' (include_path='.:/usr/share/pear:/usr/share/php') in /root/workerman-todpole/start.php on line 29

# php -v
PHP 5.4.16 (cli) (built: Apr 12 2018 19:02:01) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
# curl -Ss http://www.workerman.net/check.php | php
PHP Version >= 5.3.3                   
Extension pcntl check                  
Extension posix check                  

下载的是已经完成的程序，没有动任何文件>