Under DS 4.5, the main morphs do not show up under the Shaping tab, but if the product is installed properly, they will be available from the Parameters tab. If they aren’t, check to make sure that the following folder exists:
My Library/data/DAZ 3D/Genesis/Base/Morphs/Murgatroyd/Tween
If it doesn’t, you’ve got an installation problem. Find where the folder ended up (searching for tween should work) and move it to the right place.