To extract the files from the package, open the folder on your computer where you saved the vBulletin package and double click the vBulletin package. The system should automatically extract the package for you into its own folder.
[screen shot of OS X after the extraction is complete with the original zip and the new folder]
When the extraction complete, you will find that inside of the new folder there are two other folders called upload and another called do_not_upload.
upload - This folder contains the vBulletin files that need to be uploaded to your web server.
However, before you upload the files you must make some changes to the vBulletin configuration files. The first file is located in the upload folder itself and is called config.php.bkp. The second file is located in the core/includes folder (within the upload folder) and is called config.php.new.
You will need to rename both files, so vBulletin will be able to use them.
If you do not see file extensions in Windows Explorer, you need to enable this feature in the options on the View menu.
First you must do is to rename this file from config.php.bkp to config.php (removing the temporary .bkp extension).
[screen shot showing the renaming of config.php.bkp in OS X]
Second you must do is to rename this file from config.php.new to config.php (removing the temporary .new extension).
[screen shot showing the renaming of config.php.new in OS X]
The second folder is do_not_upload - This folder contains tools to perform various tasks on your board
searchshell.php - This file will allow you to rebuild the search index using PHP's command line processor.
vb_backup.sh - This file will allow you to run a database backup via SSH/Telnet or a scheduled backup through cron.
This file must be deleted immediately after use or it will cause a SEVERE security problem.