I am only trialling the software can I use the DDT at this point? Currently I get a message saying its not licensed and that I need to purchase it.
Yes. When you activated your license, you did not select the DDT. You selected the framework and RBS, but you did not select the DDT. Just deactivate and then reactivate and select all 3 components.
Is this correct?
Yes. As usual, it is always easier to do this as you go along, but you can always come back in and "retro-fit" your application with RBS.
Secondly if I didnt purchase the RBS and DDT to start with, just the framework to build the "proof of concept", does the Strataframe Project w/s still come in the framework?
Yes, but obviously you would not be able to add permissions, etc. So it would allow you to create a project with that outline, but it would not be effective for you until you were able to add permissions, etc.