How to install latest patch
 

I currently have version 3.7.3 PL1.

I downloaded the latest patch 3.8.3 and now going to install. I saved the files to my computer first and now I will upload them to my forum web server.

Just making sure I am right: Among the downloaded files, there is a folder called "upload". All I need to do is, to upload those files to my forum webserver, and if there is a previous version of the same file or folder, I will replace them with these right? And what about the new files (if any) in this "upload" folder? How do I know where to put those new files on my forum web server?