That number you called your version number is the date, as I understand it, on which that version was released. The actual version number is found in the Notifications page. I suspect that your version will be v3.1 or 3.2, around there, it is dated May, 2016, and I have no idea really what the schedule was at that time, IANAD. So, at a guess, I would suggest you check the actual version number of your Moodle, compare it to the compatible version number of your plugin. No point trying to install a plugin you just downloaded that is suitable for a v3.4 and is unlikely to be backward compatible. So two solutions, get the version of the plugin that suits your version of Moodle, or update your Moodle to a later version. Good luck.
Installing and upgrading help
Error installing plugin and purge cache
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