Our WPDM – Mailchimp plugin also never updates. I’ve tried numerous times and it just takes me to the Mailchimp settings page and there’s no way to update it.
Currently, we need to add a “Subscriber Tag” to our download form so we know where the users are coming from in MailChimp. “Subscriber Tags” are tags that we can label per form source. https://mailchimp.com/help/getting-started-tags/