Once installed, you can update, add, and remove components (or even the entire Qt installation) via the Maintenance Tool application that is located in the directory you installed Qt to.
Launching this tool provides pretty much the same experience as when we first installed Qt. The Add or remove components option is the one you want to add in items you may have previously not needed, including kits and even entirely new releases of the framework. Unless you actively uncheck them, components already installed on your system will not be affected.
