I purchased Todist premium thru Mac update - opening page still shows (something to the effect) "do more, purchase premium". I haven't found a way/place to enter my registration number - how do I get the product registered to get rid of that note?
The Premium is done in the back end with your account. As you can see on these forums, you are showing up as Premium.
Make sure you are logging into the correct account on all apps/plugins you are using. Also, a log out and back in again can sometimes help with this issue.