Updating from WoltLab Suite 3.0 RC 3
Open your Administration Control Panel and navigate to Configuration > Packages > Packages. Please click on the button Search for Updates located in the right corner above the package list.
Upgrading from WoltLab Community Framework 2.1 / Burning Board 4.1 / other WoltLab apps
Please read the article Upgrading to WoltLab Suite 3 to learn more.