Is there a "trial" download and a "purchase" download?
No, there is only one download. When you install the program you can use it for 30 days without restriction. After 30 days, when you open the program you will get the message saying you must "register" the program to continue using it.
When you subscribe we will send you a "License Number". You will use this number to register the program. You will then have full access to it for as long as your subscription is active.
Do not uninstall the program if you are going to subscribe or you may lose any data or setup you have already entered.