sh: /scripts/update_cwp: No such file or directory

I had mysql installed previously. While installing I got error :

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          CentOS Web Panel MailServer Installer         
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visit for help: www.centos-webpanel.com

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
MySQL root password is invalid!!!
Check password and run this script again.

I had followed the install instructions from here http://centos-webpanel.com/installation

The installation stopped. So I tried to access /scripts/update_cwp. There is no such file. Is it possible to restart the whole installation process again ?

[root@local ~]# sh /scripts/update_cwp
sh: /scripts/update_cwp: No such file or directory

Are you running the command from the location / root /?