When to upgrade, repair, or uninstall
When you have a full, functioning installation of Social Sites that you would like to upgrade to a newer version, use the Upgrade and Install option without first performing an uninstall.
Not all setup options that are available when performing a new install of Social Sites will be available during upgrade.
If you need to change options that are not presented during upgrade, see Social Sites install settings you can change via SharePoint Central Administration, for a list of Setup settings that can be changed without running Setup again.