Forget about the pre-configured VM’s, they are mostly for VMware Server. Use the .ISO image and make sure you upload the ISO to the datastore using the vSphere client.
Edit the VM settings for the CD/DVD and make sure to select “Datastore ISO file” and “Connect at power on.”
Last step is to check the VM BIOS by pressing F2 when you see the VMware Post screen (must be quick here) and make sure the boot order specifies to boot from CD first.
From here on out, it will work just like Zeroshell on hardware!
BTW in order to use VLAN’s inside a VM, you must select VLAN ID 4095 (VGT) on the Port Group associated.