Hello
 
Not sure I understand what you are looking for here.
 
CodeWarrior for HC08 V5.1 comes per default with a special edition allowing you to build up to 16K of C source code.
 
So there is no need to register for a special edition.
 
Did you try to build/debug with CW HC08 V5.1? What is happening?
 
CrasyCat