WP Auto Installer's 5 minutes installation guide:

Installing WP Auto Installer is quick and easy!

• Download WP Auto Installer using the download URL which you received by email
• Upload the zip file to your server
• Unzip the .zip file anywhere under the /public_html directory
• Set permission of the wordpress-backup-files and wordpress-installer-files folders to 777
• Access the /install.php file from your browser to complete installation.

For instance, if your domain name is example.com and you installed WPC under the /wpai folder, this would be done by typing http://www.example.com/wpai in your favorite browser. You should then see the installation screen.

• Create a MySQL database and username. Remember to give all rights to your new database to that new user.
• Creating a MySQL database and user can be easily be done from your cPanel.

When entering your MySQL credentials and if you have a cPanel account, remember to add the prefix (the name of your cPanel account) to the name of your database and username.

• Once installation is complete, delete or rename the install.php file and CHMOD config.php to 644
• Log into your WP Auto Installer install using admin/admin as the initial username/password. You may change them in the settings page.
• Enter your license key in the Settings page.

... et voila, you are ready to 1-click install your WordPress blogs!