According to Atlassian Market place page, it seems 5.7.1 is not a supported version for this plugin. That doesn't means it won't work, but may not work completely or some functionalities won't work as expected. It usually takes some time to test and state the plugin is compatible with the latest version of Confluence, when launched.
I recommend to reach the plugin developer for additional information on the plugin status for the newest versions of Confluence as well.
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