Hey, Paul.
Your idea of using the Trial and entering the registration
code when you receive it will work. Of course this assumes you'll
receive it within the 30 days
The code for the Try/Buy download is the same as on the boxed
CD, so when you get your registration key, you should be able to
simply enter that and you'll be off to the races with the full
blown, un-timed version.
One of the great things about the Trial is that unlike other
software, it is not limited in functionality. There is no scrambled
text or red notice text that it is a trial or limit to the number
of topics. Basically everything works - for 30 days.
Akshay Madan, the Adobe RoboHelp Product Manager has posted
info on the trial here
http://blogs.adobe.com/techcomm/
Thanx,
john
John Daigle
Adobe Certified RoboHelp and Captivate Instructor
Newport, Oregon