Run Zbrush once you have installed Zwrap in the plugins folder. Import the source mesh and convert it as a poly mesh.

Now import the target mesh, click on append and select the source mesh to add to your scene.

make sure both of your meshes share the same coordinates by moving the source mesh.

Select the front of the head with a square mask clicking on CTRL, then click on "hide pt" in Visibility. Make a second square selection masking both the mouth and eye sockets. Click again on Hidept, then finally click on CTRL + Shift + S to shrink the visibility up to the edges of the sockets.

select all the sockets, then create a polygroup clicking on CTRL + W, then CTRL + Shift to hide it.

You can now go to Zplugin / Zwrap.

Create reference points for strategic spots: lips, ear, eyelids, nose, chin...Report these points from the source mesh to your base mesh.

Click on start Wrapping in the wrapping section once you're done.

Click on done after the process is finished, then you can export your mesh! It is preferable to unselect groups in the export shelf before.