update by FTP

Hi! I have 8.0 Pro installed. I'm thinking to update to 8.1 by FTP. I have a DSL connection with Sympatico. Is it possible to update by FTP? If yes, could you give me a link to the procedure or some explanation. If not, how can I update? I want the best update method because I use my system everyday and I don't want to loose all of it's contents. Someone update from 8.0 to 8.2?? Did you have a lot of problems?? Thanks a lot!