I've moved to a new Mac, and unfortunately I could not sign out/de-authorize license from the old Mac because I cannot access the old unit. Now, newly installed PD 13 on my new Mac says that it has reached the limitation of the maximum number of authorization... USUALLY, software companies offer a feature on their website to remotely erase or de-authorize all licenses from all computers. A simple button to click would do the magic. PD doesn't. Instead, PD says I have to purchase a new copy. I don't think it is fair.