My Universal Plugin Manger does not have an Install tab or Upload option, so I place the jira-greenhopper-plugin-6.0.4.jar file into the atlassian-jira/WEB-INF/lib directory.
I now see the Atlassian GreenHopper 6.0.4 plugin under the User-installed Plugins section.
However, when I click the Enable button, it gives this error:
This plugin failed to enable. Your license may be invalid. Please refer to the logs for more information.
The atlassian-jira.log says:
2012-10-22 14:39:40,470 http-80-7 ERROR user 879x165x1 1fuhts0 ip.address /rest/plugins/1.0/com.pyxis.greenhopper.jira-key atlassian.plugin.manager.DefaultPluginManager There was an error loading the descriptor 'null' of plugin 'com.pyxis.greenhopper.jira'. Disabling.
com.atlassian.plugin.PluginException: Unable to load interface class: com.atlassian.upm.license.compatibility.PluginLicenseManagerAccessor
at com.atlassian.jira.plugin.component.ComponentModuleDescriptor.enabled(ComponentModuleDescriptor.java:56)