To create projects to create and develop Symbian OS programs at least one Software Development Kit (SDK) must be installed and recognized by Carbide.
Download the following SDKs from Nokia at: http://www.forum.nokia.com/.
The next time you create a project the new SDK is available as an option. This happens because every time Carbide launches it searches for newly installed SDKs and adds them to a cache file for later use. You can review which SDKs are installed by opening the Symbian SDKs preference panel.