Well, by registering an H9 Standard to your account, you can use all of the algorithms from the Max on it. This should be the case now for you. The registration process should have taken care of that. If that's not the case, you can use the Restore Purchases function under Settings.
If you're talking about actually turning a Standard into a Max, you normally do that by purchasing algorithms. I'm not sure how much sense that would make in your case since you already have all of the algorithms. So, I'm guessing that's not what you mean.