Follow this process to upgrade to MySQL version 5.0. This only needs to be done on the server.
Select open when given a choice, or double-click file in your downloads folder.
Select Unzip to save the files to the given location and to automatically run the installation program. If, for some reason, you need to run this again later, a copy will be on your hard drive at the specified location.
Click Install, and follow the instructions to complete the MySQL installation.