That file is an add-on for Confluence. You appear to be trying to run it as a java program.
Could you try using it as documented? Add it to Confluence as an add-on using Admin -> Add-ons -> install
OK, that makes sense. However, when I go to Admin > Add-ons, I don't see where I'm supposed to 'install'?
image2016-4-11 22:4:58.png
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I'd strongly recommend that you use "find new add-ons" to get it - the UPM will make sure you get the right version and do all the work.
(You could use the install link in the screenshot too, but the UPM is better)
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