[Plugin: Register Plus] Email verification link broken

I recently found this plugin and was trying to get ti working, it’s great and does exactly what I want it to do, but the link that it sends in the email does not work, I click on it twice and every time it does not activate the test user I tried it out with.

Not sure if there’s something wrong with a code that I can edit myself, I was wondering if anyone else had a similar problem?