Upgrading is quite easy:

vBulletin 3.0.x:
----------------
* overwrite all(!!) PHP-Files from /upload-Folder in your Forum
* run the installer.php in your forum's root and delete it afterwards
* verify if all code-adaptions from the actual installation-instructions are done to your forum/files
* you're done


vBulletin 3.5.x, 3.6.x and 3.7.x:
---------------------------------
* overwrite all(!!) PHP-Files from /upload-Folder in your Forum
* Update the Product "ibProArcade" in Product-Manager (set "overwrite" to YES to update it)
* you're done
