I got this error when I try to upload the plugin to my new 6.1.1 (upgraded from 5.2) evaluation version.
Could not find a handler capable of installing the add-on at jira-greenhopper-plugin-6.3.3.jar. Check that the file is a valid add-on.
I use the above tool, the result is 5055AE45FF38CA8CCD96FFEA71930077
I just downloaded the jar this morning from https://marketplace.atlassian.com/plugins/com.pyxis.greenhopper.jira
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