If you want to perform upgrade on WordPress installed from Fantastico, just follow the path below:

cPanel --> Fantastico --> Blogs --> WordPress --> Find your Current installation and click 'Upgrade'

Please click here to access our WordPress tutorials and you will find a nice one on how to upgrade your WordPress website.

Please, note that manual upgrades can cause database corruptions, data loses, and broke you script/site. So, if you are not sure that you can do this by yourself, you can always request this modifications to be made from our trained SiteGround Technical Support Team. You can do that by posting ticket in this category:

Customer's Area --> Get Support Section --> HelpDesk: (On the left side) Get Support - HelpDesk --> Exclusive Professional Services * --> Application upgrade