You can only add the UGC Web site extension to a Web site that already has the API (RESTful) Server Role or the deprecated API (in-process) Server Role installed.
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Copying resources for the UGC Web site extension
Installing the UGC extension to a .NET Web site
Installing the UGC extension to a Java/JSP Web site
Merging UGC configuration files with existing configuration files
Configuring UGC on your Web site
Prerequisites for the Session Web site extension