Pretty much the same as sal posted here http://www.xsharex.info/index.php?showtopic=18888


Download the version (the newer version of vbulletin)

Then go into your FTP

Delete every file Exept config.php

* go to http://www.yoursite.com/where_you_in...ll/upgrade.php

And follow the steps, enjoy.

Remember that you have to upload all the new files of the vBulletin exept for /includes/config.php

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Real vBulletin Upgrade Manual

Running the vBulletin Upgrade Script Warning:Certain browser plug-ins, most notably the popular Google Toolbar can have an adverse effect up the vBulletin installation and upgrade scripts. We recommend that all browser plugins be disabled while running install and upgrade scripts for vBulletin.With the newest vBulletin files uploaded to your web server, you can now proceed to run the upgrade script. To do this, point your web browser at http://www.example.com/forums/install/upgrade.php, replacing www.example.com/forums with the correct URL to your own vBulletin installation.

The first thing you will see from the install script is a log in prompt, asking you to enter your customer number. This is done to prevent other users from accidentally stumbling across your upgrade script and running it. Only you should know your customer number.Note:Your customer number is the string of numbers and letters used as the login user name for the vBulletin Members' Area. You should type your customer number carefully to avoid errors. Note that your customer number is not the same as your vBulletin license number.

When you have entered your customer number, hit the [Enter Upgrade System] button and you should be taken to the first step of the upgrade script. If after hitting the [Enter Upgrade System] button you are brought back to the customer number entry dialog, there was an error verifying your customer number. Please check for mistakes and try again.

The first page of the upgrade script will greet you and provide you with some details about the purpose of the current script.

Having read the information on the welcome page and confirmed that it is correct, click the [Next Step] button at the bottom right of the window to proceed to the next upgrade step.

As each step completes, a [Next Step] will appear at the bottom of the page. When the button appears, the step has completed successfully and clicking the button will advance you to the next step.Warningo not refresh/reload any page of the upgrade scripts. Doing so may cause database alterations to be applied twice, which can cause errors.A separate upgrade script exists to upgrade between each version of vBulletin. For example, if you are running vBulletin 3.0.0 Release Candidate 3, the system will first upgrade your database to vBulletin 3.0.0 Release Candidate 4 before progressing to the upgrade script for vBulletin 3.0.0. At the end of each script, the system will search for any additional scripts it needs to run to bring you up-to-date.

When all the necessary upgrade scripts have been run, you will be automatically redirected to the Admin CP login page.