The extension works fine but the email notification box is still unchecked by default so users never get the anniversary email. That was something that Nekda said they were going to do before the mod thread got locked and abandoned.
I wanted the emails on by default, leaving it up to the users to opt out if they don't want them, but I can't figure out how to toggle it on for anyone other than myself via the UCP. There's no option in the ACP to do it.
"Experience is what you get when you don't get what you want."