I need to transfer my Creative Suite licence CS4, from my old macbook whose hard disk has been erased to my new macbook.
What should i do?
Just install and activate CS4 on your new Macbook. No special steps required.
You're permitted up to two activations with each license, so you'll effectively be using your second activation on the new computer.
To free up the activation from the old macbook and use it elsewhere, you'll have to call Adobe since you can no longer de-activate it at your end.