Hi Eddie,
I just tried in my CW4.5 and NE64 is on as standard, you don't need any package.
You needed a service pack for CW3.1 for S12 because CW3.1 was created before the NE64.
As CW4.5 for S12 was released quite recently, the NE64 is included. I created an NE64 project with the wizard just now.
Cheers,
Alban.