Auto-Subscribe to Topic Doesn’t Seem to Work

Perhaps I’m misunderstanding the intent of this plugin. When a user subscribes to a forum, I’m hoping that with any new topics added (and existing topics), the subscriber will automatically be subscribed to it. This does not appear to be happening. According to the description of the plugin, “per default sets the initial state of the “subscribe to topic” checkbox for each user to checked”. A checkbox with this label is not present to be checked. It a toggle link. Possible BP version discrepancy?