The Install tab of the Select Options page includes:
If you have any releases of Sun Studio software installed on the system where you are running the installer, a table that displays the release name, the installation directory, and the installed components for each release.
The Missing prerequisites field, which tells you whether the system is missing any of the prerequisite software required by the components you are installing.The missing software is installed by default unless you click the Update checkbox to delete the check mark. The field does not report the absence of the patches required by the JDK software, and the installer does not install them if they are missing.
The Installation directory field, which displays the default installation directory (/opt on Solaris platforms and /opt/sun on Linux platforms) and lets you change the installation directory by typing a directory path. If you have previously installed some components of the Sun Studio 12 software, the Installation directory field displays that installation directory, and the installer will install additional components in the same directory.