Basically, you just need to open your WSAD 5.1.2 workspace in RAD 7, and the transformation will to some extent happen automatically. Alternatively you can export your workspace as a project interchange.
You will most likely encounter some problems with your project whilst migrating, so there is a forum dedicated to this here:
dW Another useful resource, where you can read more about installation and migration can be found
here. /Steinar