Before you upgrade anything, you need to backup your database with the data for the forum. We saw how to do this in Chapter 5.
As well as a database backup, make an up-to-date copy of the files on the server—preferably a full server backup of all files and folders, just in case something goes wrong or you upload the files to the wrong location and overwrite non-vBulletin files.
It's better to have made a backup and not need it than not to have made one and find that you do!
The next stage is to extract the files from the compressed archive that you downloaded. Extract them to a separate folder on your system.
Once you have done this, locate the folder called
upload, and rename it to match the name of the existing ...