If you want to perform an upgrade on SMF installed from Softaculous, just follow the steps listed below:

cPanel --> Softaculous --> Forums --> SMF. Find your installation and click on the Update icon.

If there is not any Update button/link, this means that the application is up to date and upgrade is not available.

If you want to perform a manual SMF upgrade you should read the following detailed tutorial:

http://docs.simplemachines.org/index.php?board=3.0;sort=subject

If you experience any difficulties with the upgrade, you can take an advantage of our professional services and have our experts perform the upgrade. You can order this service from your Help Desk > Exclusive Professional Services > Application Upgrade.