There is a link called 'Learn more about membership' just below the download link on the Membership plugin. Page: https://premium.wpmudev.org/project/membership/
The description might be misleading as it directs the user to the WPMU membership rather than additional information about the plugin. Redirect page:
I was just discussing the plugin with a guy who quickly browsed the site and misunderstood the link. It is just a minor thought for improvement to call it something else.