Do I need to register again or has my account already been migrated?
Your account has already been migrated. Do not register again: if you create a new account with a different email, you will start from scratch and your progress will remain in the old account, completely separate.
What you might have to do is create a password the first time you log in, using “Forgot your password?”. This is not registering: it is recovering access to an account that already exists.
If you have already registered again by mistake and have two accounts, write to us at info@kluppy.com indicating both emails: we will tell you which one has your progress and subscription, and we will help you keep the right one.