My fork: https://github.com/nacin/TracDuplicates. Tarball: https://github.com/nacin/TracDuplicates/tarball/master. easy_install handles this, as previously.
DeployDeploy Launching code from a local development environment to the production web server, so that it's available to visitors. rev 3813 includes the trac.ini changes necessary for this and needs a deploy.