1. Download GreenHopper. If you have a .zip simply rename your file as a .jar — Internet Explorer is playing tricks on you.
  2. Shut down JIRA.
  3. Replace or copy the jar into the {JIRA_HOME}/plugins/installed-plugins directory.
    (info) The default {JIRA_HOME} location is C:\Program Files\Atlassian\Application Data\JIRA, if you are using Windows. Read more about the JIRA Home directory.
  4. Remove any jira-greenhopper-plugin-*.jar from your {JIRA_INSTALL}/atlassian-jira/WEB-INF/lib directory.
    (info) The {JIRA_INSTALL} location will be something like C:\Program Files\Atlassian\JIRA 4.0.0, if you are using Windows. Read more about the JIRA Installation directory.
  5. Restart JIRA.